Test piece positioning mechanism, test piece clamping device and in-plane shearing performance detection device

Abstract

The utility model belongs to the technical field of material mechanical property detection, and discloses a test piece positioning mechanism, a test piece clamping device and an in-plane shear performance detection device.The test piece positioning mechanism comprises a workbench and a positioning assembly, the workbench is used for bearing a clamp, the clamp is provided with a clamping groove, and a test piece can be clamped in the clamping groove; the positioning assembly comprises a driving part and a positioning part, the first end of the positioning part is connected with the output end of the driving part, the second end of the positioning part can be inserted into the clamping groove, the driving part is used for driving the positioning part to move in the width direction of the clamping groove, and one end of the positioning part is driven by the driving part to move by a preset distance in the clamping groove; according to the test piece clamping device, the clamping efficiency of the test piece clamping device is remarkably improved, the positioning and clamping time is shortened, it is guaranteed that the stress axis of the test piece coincides with the loading axis of a testing machine, and the accuracy of in-plane shear performance detection results is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material mechanical property testing, in particular to a test piece positioning mechanism, a test piece clamping device and an in-plane shear property testing device. Background Technique

[0002] The in-plane shear property of a composite material can be tested according to the ASTM7078 standard. As Figure 1 shown, V-shaped notches are provided on both sides of the test piece 100 in the width direction. Usually, clamps are used to clamp both ends of the test piece 100 in the length direction, and a shear force is applied to the test piece 100 through the clamps to measure the in-plane shear property of the composite material. The existing clamps for the shear test of the V-shaped notch test piece of the composite material usually use a V-shaped centering clamping assembly to center the test piece with the clamp. It is necessary to judge whether the test piece 100 is centered with the clamp by visual observation, and it is necessary to manually adjust the bolts to adjust the position of the test piece. Moreover, the test piece 100 is prone to move during the clamping process, resulting in the non-coincidence of the force axis of the test piece 100 and the loading axis of the testing machine during the test, and the phenomenon of torsion is likely to occur during the stretching process, thereby affecting the accuracy of the test results. The existing clamps have problems of difficult centering, complex adjustment steps and long time consumption.

[0003] Therefore, it is urgent to propose a test piece positioning mechanism, a test piece clamping device and an in-plane shear property testing device to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a test piece positioning mechanism, a test piece clamping device and an in-plane shear property testing device, which can install the test piece at the center position of the clamping groove of the clamp, and improve the clamping efficiency of the test piece clamping device and the accuracy of the in-plane shear property test results.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A test piece positioning mechanism includes:

[0007] A workbench for carrying a clamp, a clamping groove is provided on the clamp, and a test piece can be clamped in the clamping groove;

[0008] A positioning assembly, the positioning assembly includes a driving member and a positioning member, the first end of the positioning member is connected to the output end of the driving member, the second end of the positioning member can be inserted into the clamping groove, and the driving member is used to drive the positioning member to move along the width direction of the clamping groove.

[0009] Further, a positioning station for limiting the clamp is arranged on the tabletop of the workbench.

[0010] Further, a first positioning groove for clamping connection with the fixture is formed on the positioning station.

[0011] Further, a through positioning port is formed at the bottom of the first positioning groove. When the fixture is clamped to the first positioning groove, the clamping groove communicates with the positioning port, and the second end of the positioning member passes through the positioning port and is inserted into the clamping groove.

[0012] Further, a clamping station for limiting the fixture is arranged on the tabletop of the workbench, and a second positioning groove for clamping connection with the fixture is formed in the clamping station; and / or,

[0013] The positioning assembly further includes a lead screw and a slide table that are in threaded fit. The lead screw is in transmission connection with the driving member, and the slide table is fixedly connected with the positioning member; and / or,

[0014] A limiting member is further arranged on the workbench, and the limiting member is used to prevent the fixture from tilting up.

[0015] Further, the limiting member is U-shaped, and the opening of the limiting member faces the workbench. One end of the fixture can pass through the limiting member and abut against the inner top wall of the limiting member.

[0016] Further, the positioning assembly further includes a mounting bracket fixedly connected with the workbench. The driving member is arranged on the mounting bracket, and the lead screw is rotatably connected with the mounting bracket.

[0017] A test piece clamping device includes a fixture and the test piece positioning mechanism as described above. The fixture includes a first fixture, a second fixture, and a clamping assembly. The first fixture is provided with a first clamping groove, and the second fixture is provided with a second clamping groove. The second end of the positioning member can be inserted into the first clamping groove or the second clamping groove. The clamping assembly includes a first clamping member and a second clamping member arranged oppositely. At least one clamping assembly is inserted into each of the first clamping groove and the second clamping groove. The clamping assembly in the first clamping groove is used to clamp one end of the test piece, and the clamping assembly in the second clamping groove is used to clamp the other end of the test piece.

[0018] Further, the fixture further includes a plurality of connecting members. At least two blind threaded holes are respectively formed on the opposite sides of the first clamping member and the second clamping member. Fixing holes corresponding to the blind threaded holes one by one are formed on both the first fixture and the second fixture. Each connecting member is in threaded connection with the corresponding fixing hole and the corresponding blind threaded hole.

[0019] An in-plane shear performance detection device includes a testing machine and the test piece clamping device as described above. The first fixture and the second fixture are both connected to the testing machine, and the testing machine is used to apply a shear force to the test piece through the first fixture and the second fixture.

[0020] Advantages of the present utility model:

[0021] The present utility model provides a test piece positioning mechanism, a test piece clamping device and an in-plane shear performance detection device, including a workbench and a positioning component. The workbench is used to carry the fixture, and the fixture is provided with a clamping groove. The test piece can be clamped in the clamping groove. The positioning component includes a driving member and a positioning member. The first end of the positioning member is connected to the output end of the driving member, and the second end of the positioning member passes through the positioning opening and can be inserted into the clamping groove. The driving member is used to drive the positioning member to move along the width direction of the clamping groove. By driving one end of the positioning member to move a preset distance in the clamping groove, the test piece is positioned at the center of the clamping groove and the fixture can clamp and fix the test piece to prevent the test piece from shifting. The centering installation of the test piece in the clamping groove is realized through the positioning component, which greatly improves the clamping efficiency of the test piece clamping device, shortens the positioning and clamping time, and during the positioning and clamping process, the test piece and the clamping block are not easy to shift, further ensuring that the force application axis of the test piece coincides with the loading axis of the testing machine, which is beneficial to improving the accuracy of the in-plane shear performance detection result. Description of the drawings

[0022] Figure 1 is a schematic structural diagram of a test piece in the prior art;

[0023] Figure 2 is an exploded view of the fixture of the present utility model;

[0024] Figure 3 is a schematic structural diagram of the test piece clamping device provided by the present utility model;

[0025] Figure 4 is a schematic structural diagram of the test piece positioning mechanism provided by the present utility model;

[0026] Figure 5 is a schematic structural diagram of the positioning component of the present utility model.

[0027] In the figure:

[0028] 100, test piece;

[0029] 1, workbench; 11, first positioning groove; 12, positioning opening; 13, second positioning groove; 14, leg;

[0030] 2. Fixture; 21. Clamping groove; 211. First clamping groove; 212. Second clamping groove; 22. First fixture; 23. Second fixture; 24. Fixing hole; 25. Clamping component; 251. First clamping piece; 252. Second clamping piece; 26. Connecting piece; 27. V-shaped clamping piece;

[0031] 3. Positioning component; 31. Driving piece; 32. Positioning piece; 33. Lead screw; 34. Slide table; 35. Mounting bracket; 36. Guide post;

[0032] 4. Limiting piece. Detailed implementation manner

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0037] As shown Figures 2 to 5 in the figure, this embodiment provides a test piece positioning mechanism, which includes a workbench 1 and a positioning component 3. The workbench 1 is used to carry a fixture 2, and a clamping groove 21 is formed in the fixture 2. A test piece 100 can be clamped in the clamping groove 21. The positioning component 3 includes a driving member 31 and a positioning member 32. The first end of the positioning member 32 is connected to the output end of the driving member 31, and the second end of the positioning member 32 can be inserted into the clamping groove 21. The driving member 31 is used to drive the positioning member 32 to move along the width direction of the clamping groove 21. By presetting the distance that the driving member 31 drives one end of the positioning member 32 to move in the clamping groove 21 as D, then making the test piece 100 closely adhere to the side of the positioning member 32 close to the center position of the clamping groove 21, at this time the test piece 100 is in the center position of the clamping groove 21. Then a clamping block is arranged on the side of the test piece 100 away from the positioning member 32, so that the clamping block abuts against the test piece 100, and the clamping block is fixedly connected to the fixture 2. Finally, the test piece 100 and the fixture 2 are removed from the positioning port 12, the positioning member 32 is removed from the clamping groove 21, and then one side of the test piece 100 is placed against a clamping block, and another clamping block is arranged to abut against the other side of the test piece 100, and this clamping block is also fixedly connected to the fixture 2, so that the test piece 100 is fixedly clamped in the center position of the clamping groove 21. Compared with the traditional method of visually judging the center position and manually adjusting the clamping blocks on both sides to fix the test piece 100, the test piece positioning mechanism provided in this embodiment can significantly improve the positioning efficiency, shorten the positioning and clamping time, and during the positioning process, the test piece 100 and the clamping block are not likely to slip due to mutual extrusion, further ensuring the accurate position of the test piece 100.

[0038] It should be noted that, as shown Figure 1 、 Figure 2 and Figure 5 in the figure, the preset distance D is the distance that the positioning member 32 moves from one side of the clamping groove 21 to the other side. The width of the clamping groove 21 is m, the thickness of the test piece 100 is n, and the thickness of the positioning member 32 is t, then D = (m - n) / 2 - t.

[0039] As shown Figures 3 to 4 in the figure, a positioning station for limiting the fixture 2 is arranged on the tabletop of the workbench 1. The fixture 2 and the test piece 100 are centered and positioned at the positioning station, which can prevent the fixture 2 from generating displacement during the positioning process of the test piece 100, and is beneficial to improving the positioning accuracy. In this embodiment, a first positioning groove 11 for clamping the fixture 2 is formed at the positioning station. Optionally, the positioning station can also limit the fixture 2 by setting a plurality of clamping blocks that can be relatively close to or far from each other to clamp the fixture 2, or by fixing the fixture 2 with bolts, etc., which is not limited here.

[0040] To avoid the movement interference of the positioning component 3 to the test piece 100 and the fixture 2, a through positioning opening 12 is provided at the bottom of the first positioning groove 11. When the fixture 2 is clamped with the first positioning groove 11, the clamping groove 21 communicates with the positioning opening 12. The second end of the positioning member 32 passes through the positioning opening 12 and is inserted into the clamping groove 21, preventing the positioning member 32 from being inserted into the clamping groove 21 from above the fixture 2, preventing the positioning component 3 from conflicting with the fixture 2 and the test piece 100, and making the tabletop of the workbench 1 clean and beautiful. Further, a clamping station for limiting the fixture 2 is provided on the tabletop of the workbench 1. The clamping station is provided with a second positioning groove 13 that is clamped with the fixture 2. After the fixture 2 is centered and positioned at the positioning station, the operator transfers the fixture 2 and the test piece 100 from the positioning station to the clamping station for clamping and fixing, thereby preventing the fixture 2 from shifting during the clamping process of the test piece 100 and facilitating the operation. Similarly, the clamping station can also limit the fixture 2 by setting a plurality of clamping blocks that can be relatively close to or far from each other to clamp the fixture 2, or by fixing the fixture 2 with bolts, etc., which is not limited here.

[0041] It should be noted that in the existing fixture 2, bolts threadedly connected to the fixture 2 are usually provided on the side wall of the clamping groove 21, and the test piece 100 is fixed between the fixture 2 by one end of the bolt pressing against the test piece 100. Since the tightening torque of the bolt is large, it is easy to generate torsion during the tightening process, resulting in one end of the fixture 2 tilting up. Therefore, a limiting member 4 is also provided on the workbench 1, and the limiting member 4 is used to prevent the fixture 2 from tilting up. Optionally, the manner in which the limiting member 4 limits the fixture 2 includes, but is not limited to, abutting, clamping, or threadedly connecting with the fixture 2, etc., which is not limited here.

[0042] In this embodiment, the limiting member 4 is U-shaped, and the opening of the limiting member 4 faces the workbench 1. One end of the fixture 2 can pass through the limiting member 4 and abut against the inner top wall of the limiting member 4, thereby preventing the fixture 2 from tilting up when the bolt is tightened. The U-shaped limiting member 4 has the advantages of simple structure, less occupied space, easy processing, and low production cost. Further, the limiting member 4 is provided at the positioning station. When the fixture 2 is clamped with the first positioning groove 11, one end of the fixture 2 can abut against the inner top wall of the limiting member 4, thereby preventing the fixture 2 from tilting up when the bolt is tightened. Similarly, the clamping station can also be provided with a limiting member 4. When the fixture 2 is clamped with the second positioning groove 13, one end of the fixture 2 can pass through the limiting member 4 and abut against the inner top wall of the limiting member 4, thereby preventing the fixture 2 from tilting up when the bolt is tightened.

[0043] Further, the limiting member 4 is height-adjustably connected to the workbench 1. According to the heights of the fixture 2 and the test piece 100, the height of the limiting member 4 can be adjusted to ensure that one end of the fixture 2 abuts against the inner top wall of the limiting member 4, thereby improving the versatility of the limiting member 4. Specifically, the connection manner between the limiting member 4 and the workbench 1 includes but is not limited to snap connection or threaded connection, etc., and no specific limitation is made here.

[0044] In this embodiment, legs 14 are further provided below the tabletop of the workbench 1. The legs 14 not only support the tabletop of the workbench 1, but also provide an installation space for the positioning assembly 3.

[0045] As Figures 4 to 5 shown, the positioning assembly 3 further includes a lead screw 33 and a slide table 34 in threaded cooperation. The lead screw 33 is in transmission connection with the driving member 31, and the slide table 34 is fixedly connected to the positioning member 32. Through the lead screw 33 and the slide table 34 in threaded cooperation, the accuracy and stability of the movement of the positioning member 32 in the width direction of the clamping groove 21 are improved. In this embodiment, the displacement accuracy of the positioning block can reach 0.05 mm, greatly improving the positioning accuracy of the test piece positioning mechanism and being beneficial to improving the accuracy of the test. In this embodiment, the driving member 31 is a stepping motor, which has the advantages of high precision, low cost, and small volume. In other embodiments, the driving member 31 includes but is not limited to a servo motor, etc., and no specific limitation is made here.

[0046] Further, the positioning assembly 3 further includes a mounting bracket 35 fixedly connected to the workbench 1. The driving member 31 is arranged on the mounting bracket 35, and the lead screw 33 is rotatably connected to the mounting bracket 35, providing stable support for the lead screw 33 and preventing the lead screw 33 from shaking during rotation. Further, the driving member 31 is arranged on the mounting bracket 35, facilitating the overall installation or disassembly of the positioning assembly 3.

[0047] In this embodiment, a guide post 36 extending along the axial direction of the lead screw 33 is further arranged on the mounting bracket 35. The slide table 34 is slidably connected to the guide post 36, thereby guiding the movement of the slide table 34 in the width direction of the clamping groove 21 and preventing its movement path from deviating. At the same time, since the slide table 34 and the positioning member 32 have a certain weight, the guide post 36 can also support the slide table 34. In this embodiment, a guide post 36 is arranged on each side of the lead screw 33, which can provide balanced support force for the slide table 34. Optionally, the number of the guide posts 36 can be adaptively set according to the volume and weight of the slide table 34. For example, the number of the guide posts 36 can be one, three, four, or six, etc., and no specific limitation is made here.

[0048] As Figures 1 to 3As shown in the figure, this embodiment also provides a clamping device for in-plane shear performance test specimens, which includes a fixture 2 and the test specimen positioning mechanism in any of the above embodiments. The fixture 2 includes a first fixture 22, a second fixture 23 and a clamping assembly 25. The first fixture 22 is provided with a first clamping groove 211, and the second fixture 23 is provided with a second clamping groove 212. The second end of the positioning member 32 can be inserted into the first clamping groove 211 or the second clamping groove 212. The clamping assembly 25 includes a first clamping member 251 and a second clamping member 252 which are arranged oppositely. At least one clamping assembly 25 is inserted into each of the first clamping groove 211 and the second clamping groove 212. The clamping assembly 25 in the first clamping groove 211 is used to clamp one end of the test specimen 100, and the clamping assembly 25 in the second clamping groove 212 is used to clamp the other end of the test specimen 100. By driving the positioning member 32 to move a preset distance D in the clamping groove 21, the test specimen 100 can be positioned at the center position in the clamping groove 21. Then, the test specimen 100 is fixed by the first clamping member 251 and the second clamping member 252, so that the test specimen 100 is clamped at the center position of the clamping groove 21, ensuring that the force axis of the test specimen 100 coincides with the loading axis of the testing machine, and further improving the accuracy of the detection results.

[0049] Among them, the clamping groove 21 includes a first clamping groove 211 and a second clamping groove 212. The width of the first clamping groove 211 is m1, and the width of the second clamping groove 212 is m2.

[0050] Furthermore, the fixture 2 further includes a plurality of connecting members 26. At least two blind threaded holes are respectively formed on the opposite sides of the first clamping member 251 and the second clamping member 252. Fixed holes 24 corresponding to the blind threaded holes one by one are formed on both the first fixture 22 and the second fixture 23. Each connecting member 26 is threadedly connected to the corresponding fixed hole 24 and the corresponding blind threaded hole. In order to ensure the clamping force of the first clamping member 251 and the second clamping member 252 on the test specimen 100, a relatively large tightening torque is usually applied to the connecting members 26. When tightening the connecting members 26 on one side, shear forces will be generated on the connecting members 26, the first clamping member 251 and the second clamping member 252 on the other side, resulting in relative slippage or torsion of the connecting members 26, the first clamping member 251 and the second clamping member 252 on the other side. Therefore, by respectively forming at least two blind threaded holes on the opposite sides of the first clamping member 251 and the second clamping member 252, the stability of the connection between the connecting member 26 and the first clamping member 251 or the second clamping member 252 can be improved, making it difficult for the connecting members 26, the first clamping member 251 and the second clamping member 252 to undergo relative slippage or torsion, further ensuring the accuracy of the position of the test specimen 100. At the same time, setting the blind threaded holes can also prevent the connecting members 26 from directly contacting the test specimen 100 and prevent damage to the test specimen 100. Among them, the tightening torque is 25 N to 60 N.

[0051] To facilitate the clamping of the test piece 100, the fixture 2 further includes a V-shaped clamping member 27. The V-shaped clamping member 27 is disposed between the first fixture 22 and the second fixture 23 and is detachably connected to the first fixture 22 and the second fixture 23. The V-shaped clamping member 27 can be clamped with the V-shaped notch of the test piece 100, thereby playing a supporting role for the first fixture 22 and the second fixture 23, facilitating the installation of the test piece 100 and the second fixture 23 after the test piece 100 is installed with the first fixture 22. After the clamping is completed, the V-shaped clamping member 27 needs to be removed, and then the in-plane shear performance detection test is carried out. Among them, the specific structure of the V-shaped clamping member 27 belongs to the prior art and will not be elaborated here.

[0052] This embodiment also provides an in-plane shear performance detection device, including a testing machine (not shown in the figure) and the above-mentioned test piece clamping device. Both the first fixture 22 and the second fixture 23 are connected to the testing machine. The testing machine is used to apply a shear force to the test piece 100 through the first fixture 22 and the second fixture 23. Through the test piece clamping device, the test piece 100 is clamped to the center position of the fixture 2. After the testing machine is started, the force axis of the test piece 100 can be located on the loading axis of the testing machine, thereby improving the accuracy of the in-plane shear performance detection.

[0053] The following combines Figures 1 to 5 Briefly describe the specific detection method of the above in-plane shear performance detection device, including the following steps:

[0054] S1: Clamp the first fixture 22 with the first positioning groove 11;

[0055] S2: Start the driving member 31 to drive the positioning member 32 to abut against one side of the first clamping groove 211;

[0056] S3: Calculate the preset distance D1 according to D1 = (m1 - n) / 2 - t, and start the driving member 31 to drive the positioning member 32 to move a preset distance D1 along the width direction of the clamping groove 21 to the other side of the first clamping groove 211;

[0057] S4: Place the first end of the test piece 100 closely against the side of the positioning member 32 close to the center position of the first clamping groove 211, and install the first clamping member 251 on the other side of the test piece 100;

[0058] S5: Transfer the first fixture 22 and the test piece 100 to the clamping station, and make the first fixture 22 clamped with the second positioning groove 13;

[0059] S6: Install the second clamping member 252 on the side of the test piece 100 away from the first clamping member 251, so that the first clamping member 251 and the second clamping member 252 clamp the first end of the test piece 100;

[0060] S7: Clamp the two V-shaped clamping parts 27 to the two V-shaped notches of the test piece 100 respectively and connect them to the first fixture 22;

[0061] S8: Clamp the second fixture 23 to the first positioning groove 11;

[0062] S9: Start the driving part 31 to drive the positioning part 32 to abut against one side of the second clamping groove 212;

[0063] S10: Calculate the preset distance D2 according to D2 = (m2 - n) / 2 - t, and start the driving part 31 to drive the positioning part 32 to move a preset distance D2 along the width direction of the second clamping groove 212 to the other side of the second clamping groove 212;

[0064] S11: Invert the test piece 100 and the first fixture 22 installed in S6 so that the first clamping groove 211 faces the second clamping groove 212. Place the second end of the test piece 100 against one side of the positioning part 32 close to the center position of the second clamping groove 212, and install the first clamping part 251 on the other side of the test piece 100;

[0065] S12: Transfer the first fixture 22, the test piece 100 and the second fixture 23 to the clamping station and make the second fixture 23 clamped to the second positioning groove 13;

[0066] S13: Install the second clamping part 252 on the side of the second end of the test piece 100 away from the first clamping part 251 so that the first clamping part 251 and the second clamping part 252 clamp the second end of the test piece 100;

[0067] S14: Increase the tightening torque and tighten each connecting part 26 again;

[0068] S15: Connect the first fixture 22 and the second fixture 23 to the testing machine respectively and remove the V-shaped clamping parts 27;

[0069] S16: Start the testing machine to detect the in-plane shear performance of the test piece 100.

[0070] Through the above method, the two ends of the test piece 100 can be installed at the exact middle positions of the first clamping groove 211 and the second clamping groove 212 respectively, ensuring that the force axis of the test piece 100 coincides with the loading axis of the testing machine, and significantly reducing the clamping time of the test piece 100. After clamping, connect the first fixture 22 and the second fixture 23 to the testing machine respectively, and then the in-plane shear performance detection test can be carried out. The connection methods of the first fixture 22 and the second fixture 23 to the testing machine belong to the prior art and will not be elaborated here.

[0071] It should be noted that the test piece positioning mechanism provided in this embodiment can not only be used to assist in the centering and positioning of the test piece 100 with the first fixture 22 and the second fixture 23 in the in-plane shear performance detection test, but also can be used to assist in the positioning of test pieces for other detection tests, which is not specifically limited herein.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A test piece positioning mechanism, characterized in that: include: A workbench (1) is used to carry a clamp (2), wherein the clamp (2) is provided with a clamping groove (21), and a test piece (100) can be clamped in the clamping groove (21); A positioning assembly (3), the positioning assembly (3) comprising a driving member (31) and a positioning member (32), the first end of the positioning member (32) being connected to the output end of the driving member (31), the second end of the positioning member (32) being insertable into the clamping groove (21), and the driving member (31) being used to drive the positioning member (32) to move along the width direction of the clamping groove (21).

2. The test piece positioning mechanism according to claim 1, characterized in that: A positioning station for limiting the position of the clamp (2) is arranged on the table surface of the workbench (1).

3. The test piece positioning mechanism according to claim 2, characterized in that: The positioning station is provided with a first positioning groove (11) which is clamped with the clamp (2).

4. The test piece positioning mechanism according to claim 3, characterized in that: A through positioning opening (12) is provided at the bottom of the first positioning groove (11); when the clamp (2) is engaged with the first positioning groove (11), the clamping groove (21) is connected with the positioning opening (12); the second end of the positioning member (32) passes through the positioning opening (12) and is inserted into the clamping groove (21).

5. The test piece positioning mechanism according to claim 1, characterized in that: The workbench (1) is provided with a clamping station for limiting the position of the clamp (2), and the clamping station is provided with a second positioning groove (13) for clamping with the clamp (2); and / or, The positioning assembly (3) further comprises a screw (33) and a slide (34) in threaded engagement, wherein the screw (33) is transmission-connected to the driving member (31), and the slide (34) is fixedly connected to the positioning member (32); and / or, A limiting member (4) is also provided on the workbench (1), and the limiting member (4) is used to prevent the clamp (2) from tilting.

6. The test piece positioning mechanism according to claim 5, characterized in that: The limiting member (4) is U-shaped, and the opening of the limiting member (4) faces the workbench (1); one end of the clamp (2) can be inserted into the limiting member (4) and abut against the inner top wall of the limiting member (4).

7. The test piece positioning mechanism according to claim 5, characterized in that: The positioning assembly (3) further comprises a mounting frame (35) fixedly connected to the workbench (1), the driving member (31) is arranged on the mounting frame (35), and the lead screw (33) is rotatably connected to the mounting frame (35).

8. A test piece clamping device, characterized in that: The invention comprises a fixture (2) and a test piece positioning mechanism as claimed in any one of claims 1 to 7, wherein the fixture (2) comprises a first fixture (22), a second fixture (23) and a clamping assembly (25), the first fixture (22) is provided with a first clamping groove (211), the second fixture (23) is provided with a second clamping groove (212), the second end of the positioning member (32) can be inserted into the first clamping groove (211) or the second clamping groove (212), and the clamping assembly (25) is provided with a second clamping groove (212). 5) comprises a first clamping member (251) and a second clamping member (252) arranged opposite to each other, and at least one of the clamping components (25) is inserted into the first clamping groove (211) and the second clamping groove (212), respectively, and the clamping component (25) in the first clamping groove (211) is used to clamp one end of the test piece (100), and the clamping component (25) in the second clamping groove (212) is used to clamp the other end of the test piece (100).

9. The test piece clamping device according to claim 8, characterized in that: The clamp (2) further comprises a plurality of connecting members (26), at least two threaded blind holes are respectively provided on opposite sides of the first clamp (251) and the second clamp (252), the first clamp (22) and the second clamp (23) are both provided with fixing holes (24) corresponding one to one to the threaded blind holes, and each of the connecting members (26) is threadedly connected to the corresponding fixing hole (24) and the corresponding threaded blind hole.

10. An in-plane shear performance detection device, characterized in that: The invention comprises a testing machine and a test piece clamping device as claimed in any one of claims 8 to 9, wherein the first clamp (22) and the second clamp (23) are both connected to the testing machine, and the testing machine is used to apply a shear force to the test piece (100) through the first clamp (22) and the second clamp (23).

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