Test fixture

Abstract

The utility model relates to a test fixture, and relates to the technical field of power battery test. The utility model aims to improve the accuracy of tension test. The test fixture comprises two clamping structures. The clamping structure comprises a clamping outer frame, a first blocking structure, a second blocking structure, a first baffle, a second baffle and a connecting structure. The clamping outer frame comprises a first supporting column, a second supporting column and a base. The first baffle is connected with the first supporting column, the first baffle is arranged between the first supporting column and the first blocking structure and can move in the first direction, and the first direction is the direction in which the first blocking structure and the first baffle are oppositely arranged. The second baffle is connected with the second supporting column, arranged between the second supporting column and the second blocking structure and capable of moving in the first direction. Each clamping structure can clamp the two ends of one to-be-tested object, the situation that torsion occurs at the welding position in the tension test is prevented, and therefore it is guaranteed that the to-be-tested objects are always subjected to tension on the same straight line, and the accuracy of the tension test is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power battery testing, and in particular to a test fixture. Background Art

[0002] Power batteries are one of the most core components in new energy vehicles, requiring multiple battery modules to be connected in series or parallel. To ensure weld strength, engineers use a test fixture to secure the tabs at the weld location. A tensile tester applies tension for testing, requiring the use of a test fixture.

[0003] See CN207717507U, a tensile test fixture comprising a connecting portion and a clamping portion. The connecting portion is used to connect to a tensile tester, and the clamping portion comprises two relatively movable clamping blocks and two relatively movable sliders. The clamping block is positioned between the two sliders to clamp the object under test. When the two sliders approach each other, pressure is applied to the two clamping blocks, forcing them to move closer together and clamp the object under test. However, using this test fixture can easily cause twisting at the weld point of the object under test, thereby reducing test accuracy. Utility Model Content

[0004] The present application provides a test fixture for improving the accuracy of tensile testing.

[0005] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] The test fixture provided in the present application includes two clamping structures. The clamping structure includes a clamping outer frame, a first blocking structure, a second blocking structure, a first baffle, a second baffle and a connecting structure. The clamping outer frame includes a first pillar, a second pillar and a base. The first pillar and the second pillar are located on the same side of the base and are connected to the base. The first blocking structure is arranged in the clamping outer frame and is connected to the base. The second blocking structure is arranged in the clamping outer frame and is connected to the base. The first baffle is connected to the first pillar, the first baffle is arranged between the first pillar and the first blocking structure, and can move along the first direction, which is the direction in which the first blocking structure and the first baffle are relatively arranged. The second baffle is connected to the second pillar, the second baffle is arranged between the second pillar and the second blocking structure, and can move along the first direction. The connecting structure is arranged outside the clamping outer frame and is connected to the base.

[0007] In the aforementioned test fixture, two clamping structures respectively clamp two laser-welded tabs. Because a first baffle is positioned between a first support and a first blocking structure and is movable in a first direction, the first blocking structure and the first baffle cooperate to clamp one end of one of the tabs. Similarly, because a second baffle is positioned between a second support and a second blocking structure and is movable in the first direction, the second blocking structure and the second baffle cooperate to clamp the other end of the tab. The connecting structure is connected to a tensile testing machine. During a tensile test, the two connecting ends of the tensile testing machine apply opposite tensile forces to the test fixture, causing the two clamping structures to move away from each other. Because the two clamping structures are vertically symmetrical and include two clamping positions, each clamping structure can clamp both ends of a tab. During the tensile test, the welded joints are subjected to uniform tensile force, effectively preventing twisting at the welded joints. This ensures that the two tabs are always subjected to tensile forces in the same straight line, improving the accuracy of the tensile test.

[0008] As a possible implementation, the test fixture further includes a first compression screw and a second compression screw. A first through-hole is provided on the first support, a first mounting threaded hole is provided on the surface of the first baffle plate near the first support, the first compression screw passes through the first through-hole, and one end of the first compression screw is threadedly connected to the first mounting threaded hole. A second through-hole is provided on the second support, a second mounting threaded hole is provided on the surface of the second baffle plate near the second support, the second compression screw passes through the second through-hole, and one end of the second compression screw is threadedly connected to the second mounting threaded hole.

[0009] As one possible implementation, the test fixture further includes a first fastening post and a second fastening post. A first fastening hole is provided on a side surface of the first baffle plate, and the side surface of the first baffle plate is parallel to the extension direction of the first compression screw. The first fastening hole is connected to the first mounting threaded hole, and the first fastening post can be inserted into the first fastening hole. A second fastening hole is provided on a side surface of the second baffle plate, and the side surface of the second baffle plate is parallel to the extension direction of the second compression screw. The second fastening hole is connected to the second mounting threaded hole, and the second fastening post can be inserted into the second fastening hole.

[0010] As a possible implementation, the test fixture further includes a third clamping screw and a fourth clamping screw. The base is provided with a third through-hole and a fourth through-hole. The surface of the first blocking structure near the base is provided with a third mounting threaded hole, and the surface of the second blocking structure near the base is provided with a fourth mounting threaded hole. The third clamping screw passes through the third through-hole, one end of the third clamping screw being threadedly connected to the third mounting threaded hole. The fourth clamping screw passes through the fourth through-hole, one end of the fourth clamping screw being threadedly connected to the fourth mounting threaded hole.

[0011] As a possible implementation, the test fixture further includes a third fastening post and a fourth fastening post. A third fastening hole is provided on a side surface of the first blocking structure, the side surface of the first blocking structure being parallel to the extension direction of the third compression screw, the third fastening hole is connected to the third mounting threaded hole, and the third fastening post can be inserted into the third fastening hole. A fourth fastening hole is provided on a side surface of the second blocking structure, the side surface of the second blocking structure being parallel to the extension direction of the fourth compression screw, the fourth fastening hole is connected to the fourth mounting threaded hole, and the fourth fastening post can be inserted into the fourth fastening hole.

[0012] As a possible implementation, the size of the third via in the first direction is greater than or equal to the size of the third compression screw, and the first blocking structure can move in the first direction. The size of the fourth via in the first direction is greater than or equal to the size of the fourth compression screw, and the second blocking structure can move in the first direction.

[0013] As a possible implementation, the connection structure includes a connecting screw and a matching nut. The base is also provided with a fifth through hole. One end of the connecting screw is connected to the fifth through hole, and the nut is connected to the connecting screw.

[0014] As a possible implementation manner, at least one of the first blocking structure, the second blocking structure, the first baffle and the second baffle is provided with anti-slip stripes.

[0015] As a possible implementation manner, the center of the projection of the connecting structure on the base is located between the projections of the first blocking structure and the second blocking structure on the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a test fixture provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of another test fixture provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of another test fixture provided in an embodiment of the present application.

[0019] In the figure, 1-clamping structure, 11-clamping frame, 12-first blocking structure, 13-second blocking structure, 14-first baffle, 15-second baffle, 16-connecting structure, 111-first pillar, 112-second pillar, 113-base, 17-first clamping screw, 18-second clamping screw, 171-first through hole, 141-first mounting threaded hole, 181-second through hole, 151-second mounting threaded hole, 19-first fastening column, 20-second fastening column, 114-third through hole, 115-fourth through hole, 121-third mounting threaded hole, 131-fourth mounting threaded hole, 21-third clamping screw, 22-fourth clamping screw, 23-third fastening column, 24-fourth fastening column, 25-connecting screw, 26-nut, 27-fifth through hole, 28-anti-slip stripe. DETAILED DESCRIPTION

[0020] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0022] In the description of the embodiments, unless otherwise specified, “ / ” means “or”. For example, A / B can mean A or B. “And / or” in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, “at least one” and “a plurality of” refer to two or more. Words such as “first” and “second” do not limit the quantity and execution order, and words such as “first” and “second” do not necessarily limit them to be different.

[0023] With the dwindling availability of fossil energy and the growing severity of environmental issues, the development of new energy sources has become an inevitable trend, and new energy vehicles have become the development direction of the automotive industry. One of the most core components of new energy vehicles is the power battery, which typically consists of multiple battery modules connected in parallel or in series.

[0024] Battery modules are connected by aluminum or copper tabs. Engineers typically weld or bolt these tabs to the battery module's battery terminals. They then laser weld the tabs between the battery module terminals to create series or parallel connections between multiple battery modules.

[0025] To ensure welding strength, engineers use a test fixture to fix the bar at the welding position and use a tensile testing machine to apply tension for testing. However, during the tensile test, the use of current test fixtures can easily cause torsion at the welding position, thereby reducing the accuracy of the test.

[0026] In view of this, the present application provides a test fixture. For example, Figure 1 As shown, Figure 1 The components of the test fixture are shown. The test fixture includes two clamping structures 1. The clamping structure includes a clamping outer frame 11, a first blocking structure 12, a second blocking structure 13, a first baffle 14, a second baffle 15, and a connecting structure 16. The clamping outer frame 11 includes a first support 111, a second support 112, and a base 113. The first support 111 and the second support 112 are located on the same side of the base 113 and are connected to the base 113. The first blocking structure 12 is arranged in the clamping outer frame 11 and is connected to the base 113. The second blocking structure 13 is arranged in the clamping outer frame 11 and is connected to the base 113.

[0027] For example, the first direction is the direction indicated by the arrow in the figure. The first baffle 14 is connected to the first pillar 111, disposed between the first pillar 111 and the first blocking structure 12, and is movable along the first direction X. The first direction is the direction in which the first blocking structure 12 and the first baffle 14 are disposed relative to each other. The second baffle 15 is connected to the second pillar 112, disposed between the second pillar 112 and the second blocking structure 13, and is movable along the first direction. The connecting joint 16 is disposed outside the clamping frame 11 and is connected to the base 113.

[0028] The two clamping structures 1 respectively clamp two laser-welded tabs. Since the first baffle 14 is positioned between the first support 111 and the first blocking structure 12 and is movable in a first direction, as the first baffle 14 continuously moves toward the first blocking structure 12, one end of one of the two tabs is continuously driven by the first baffle 14 until one end of the tab is securely clamped between the first baffle 14 and the first blocking structure 12 (forming a clamping position), thereby achieving a clamping function. Similarly, since the second baffle 15 is positioned between the second support 112 and the second blocking structure 13 and is movable in the first direction, as the second baffle 15 continuously moves toward the second blocking structure 13, one end of the other tab is continuously pushed by the second baffle 15 toward the second blocking structure 13 until the other end of the tab is securely clamped between the second baffle 15 and the second blocking structure 13 (forming another clamping position), thereby achieving a clamping function.

[0029] The connecting structure 16 is connected to the tensile testing machine, and the connecting structure of one of the two clamping structures 1 is connected to one connecting end of the tensile testing machine, and the connecting structure 16 of the other clamping structure 1 is connected to the other connecting end of the tensile testing machine. When performing a tensile test, the two connecting ends of the tensile testing machine respectively apply tension in opposite directions to the test fixture, so that the two clamping structures move toward each other. Since the two clamping structures 1 are symmetrical up and down, and the clamping structure includes two clamping positions, each clamping structure can clamp both ends of a piece, so during the tensile test, it can ensure that the welding position is subjected to uniform tension, effectively preventing torsion at the welding position, thereby ensuring that the two pieces are always subjected to tension in the same straight line, thereby improving the accuracy of the tensile test.

[0030] For example, Figure 2 As shown, the test fixture further includes a first compression screw 17 and a second compression screw 18. A first through-hole 171 is provided on the first support 111, and a first mounting threaded hole 141 is provided on the surface of the first baffle 14 near the first support 111. The first compression screw 17 passes through the first through-hole 171, and one end of the first compression screw 17 is threadedly connected to the first mounting threaded hole 141. A second through-hole 181 is provided on the second support 112, and a second mounting threaded hole 151 is provided on the surface of the second baffle 15 near the second support 112. The second compression screw 18 passes through the second through-hole 181, and one end of the second compression screw 18 is threadedly connected to the second mounting threaded hole 151.

[0031] The first support 111 is provided with a first through hole, and the first pressing screw 17 can enter the inside of the clamping outer frame 11 from the side of the first support 111 away from the first baffle 14 through the first through hole 171. The surface of the first baffle 14 close to the first support 111 is provided with a first mounting threaded hole 141, and the first pressing screw 17 can be connected to the first baffle 14 through the first mounting threaded hole 141. For example, Figure 2 As shown, by twisting the first clamping screw 17 clockwise, the first clamping screw 17 engages with the threads of the corresponding first mounting threaded hole 141, driving the first baffle 14 to move toward the first blocking structure 12, thereby clamping one end of the sample to be tested. By twisting the first clamping screw 17 counterclockwise, the first clamping screw 17 engages with the threads of the corresponding first mounting threaded hole 141, driving the first baffle 14 to move away from the first blocking structure 12, thereby loosening one end of the sample to be tested.

[0032] The second support post 112 is provided with a second through-hole, through which the second compression screw 18 can pass from the side of the second support post 112 away from the second baffle 15 and into the interior of the clamping outer frame 11. The surface of the second baffle 15 near the second support post 112 is provided with a second mounting threaded hole 151, through which the second compression screw 18 can be connected to the second baffle 15.

[0033] As a possible implementation, Figure 2 As shown, the test fixture further includes a first fastening post 19 and a second fastening post 20. A first fastening hole is provided on the side surface of the first baffle 14. The side surface of the first baffle 14 is parallel to the extension direction of the first compression screw 17 and is connected to the surface of the first baffle 14 near the first support 111. The first fastening hole is connected to the first mounting threaded hole, and the first fastening post 19 can be inserted into the first fastening hole. A second fastening hole is provided on the side surface of the second baffle 15. The side surface of the second baffle 15 is parallel to the extension direction of the second compression screw 18 and is connected to the surface of the second baffle 15 near the second support 112. The second fastening hole is connected to the second mounting threaded hole, and the second fastening post 20 can be inserted into the second fastening hole.

[0034] As can be seen from the foregoing description, the relative position of the first baffle 14 and the first blocking structure 12 can be adjusted by rotating the first compression screw 17, and the relative position of the second baffle 15 and the second blocking structure 13 can be adjusted by rotating the second compression screw 18. After the relative position between the first baffle 14 and the first blocking structure 12 is adjusted, the engineer can fix the position of the first baffle 14 by inserting the first fastening column 19 into the first fastening hole. Because the first fastening hole is connected to the first mounting threaded hole, a portion of the communication channel between the first fastening hole and the first mounting threaded hole is shared by both (hereinafter referred to as the shared area). After the first fastening column 19 is inserted into the first fastening hole, a portion of the first fastening column 19 also enters the first mounting threaded hole. When the first fastening column 19 is inserted into the common area, it will occupy the common area, so it can block the first compression screw 17 from going deeper, so that the first compression screw 17 can only rotate to the position where it touches the first fastening column 19 (i.e., the common area). Since the first compression screw 17 cannot continue to move in the direction close to the first blocking structure 12, the first baffle cannot continue to move in the direction close to the first blocking structure 12, thereby preventing the first baffle 14 from moving, so that the sample to be tested is always in the same stress state during the entire tensile test. When the sample to be tested is tested and needs to be replaced or the clamping position of the sample to be tested is adjusted, the first fastening column 19 is pulled out of the first fastening hole. Since the first compression screw 17 is no longer blocked by the first fastening column 19, the position of the first baffle 14 becomes adjustable again. The design of the second fastening column 20 and the second fastening hole is the same as that of the first fastening column 19 and the first fastening hole, and will not be repeated here.

[0035] As a possible implementation method, the first fastening column and the second fastening column are both threaded columns, and the first fastening hole and the second fastening hole are both threaded holes. Since the threaded column and the threaded hole both contain threaded structures, the friction required during the insertion and extraction process is greater, and the connection is more reliable, making the test fixture less susceptible to external influences, avoiding the position displacement of the first baffle or the second baffle during the tensile test, and indirectly improving the accuracy of the tensile test.

[0036] In some embodiments, as Figure 3As shown, the test fixture also includes a third clamping screw 21 and a fourth clamping screw 22. A third through-hole 114 and a fourth through-hole 115 are provided on the base 113. A third mounting threaded hole 121 is provided on the surface of the first blocking structure 12 near the base, and a fourth mounting threaded hole 131 is provided on the surface of the second blocking structure 13 near the base 113. The third clamping screw 21 passes through the third through-hole 114, and one end of the third clamping screw 21 is threadedly connected to the third mounting threaded hole 131. The fourth clamping screw 22 passes through the fourth through-hole 115, and one end of the fourth clamping screw 22 is threadedly connected to the fourth mounting threaded hole 131.

[0037] The third compression screw 21 passes through the third through-hole 114 on the base 113 and engages with the threads in the third mounting threaded hole 121 on the surface of the first blocking structure 12. This prevents the first blocking structure 12 from shifting during the entire tensile test, thereby ensuring the accuracy of the tensile test. The fourth compression screw 22 passes through the fourth through-hole 115 on the base 113 and engages with the threads in the fourth mounting threaded hole 131 on the surface of the second blocking structure 13. This prevents the second blocking structure 13 from shifting during the entire tensile test, thereby ensuring the accuracy of the tensile test.

[0038] As a possible implementation, Figure 3 As shown, the test fixture further includes a third fastening post 23 and a fourth fastening post 24. A third fastening hole is provided on the side surface of the first blocking structure 12, the side surface of the first blocking structure 12 being parallel to the extension direction of the third compression screw, the third fastening hole being connected to the third mounting threaded hole, and the third fastening post can be inserted into the third fastening hole. A fourth fastening hole is provided on the side surface of the second blocking structure 13, the side surface of the second blocking structure 13 being parallel to the extension direction of the fourth compression screw 22, the fourth fastening hole being connected to the fourth mounting threaded hole, and the fourth fastening post can be inserted into the fourth fastening hole.

[0039] The third and fourth fastening posts 23 and 24 are provided to further secure the positions of the first and second blocking structures 12 and 13. Specifically, when the positions of the first and second blocking structures 12 and 13 need to be adjusted, the third and fourth fastening posts 23 and 24 are removed from the third and fourth fastening holes, respectively. After the positions of the first and second blocking structures 12 and 13 are adjusted, the third and fourth fastening posts 23 and 24 are inserted into the third and fourth fastening holes, respectively. Because the third fastening hole and the third mounting threaded hole partially overlap, when the third fastening post 23 occupies the overlapping area, the third compression screw 21 cannot be inserted further. The third compression screw 21 is blocked by the third fastening post 23, thereby locking the first blocking structure. Similarly, the fourth compression screw 22 is blocked by the fourth fastening post 24, ensuring that the first and second blocking structures 12 and 13 do not shift during the entire tensile test, thereby ensuring the accuracy of the tensile test.

[0040] As a possible implementation, Figure 2 As shown, at least one of the first blocking structure, the second blocking structure, the first baffle plate and the second baffle plate is provided with anti-slip stripes. Figure 2 For the purpose of illustration, the first blocking structure 12, the second blocking structure 13, the first baffle 14, and the second baffle 15 are all provided with anti-slip stripes 28. The provision of anti-slip stripes 28 can further increase the friction between the test sample and the first blocking structure 12 and the first baffle 14, as well as the friction between the test sample and the second blocking structure 13 and the second baffle 15, thereby ensuring that the position of the test sample does not shift along the first direction during the tensile test, further improving the accuracy of the tensile test.

[0041] As a possible implementation method, the third fastening column and the fourth fastening column are both threaded columns, and the third fastening hole and the fourth fastening hole are both threaded holes. Since the threaded column and the threaded hole both contain threaded structures, the friction required during the insertion and extraction process is greater, and the connection is more reliable, making the test fixture less susceptible to external influences, avoiding the positional displacement of the first blocking structure or the second blocking structure during the tensile test, and indirectly improving the accuracy of the tensile test.

[0042] As a possible implementation, Figure 3As shown, the dimension L1 of the third through hole 114 in the first direction is greater than or equal to the dimension L2 of the third compression screw 21. When the dimension L1 of the third through hole 114 in the first direction is greater than the dimension L2 of the third compression screw 21, the third compression screw 21 can move in the first direction within the third through hole, thereby driving the first blocking structure to move in the first direction. The dimension L3 of the fourth through hole 115 in the first direction is greater than or equal to the dimension L4 of the fourth compression screw 22. When the dimension L3 of the fourth through hole 115 in the first direction is greater than the dimension L4 of the fourth compression screw 22, the fourth compression screw 22 can move in the first direction within the fourth through hole, thereby driving the second blocking structure 13 to move in the first direction within the fourth through hole. When the dimension L1 of the third through hole 114 in the first direction is greater than the dimension L2 of the third clamping screw 21, and the dimension L3 of the fourth through hole 115 in the first direction is greater than the dimension L4 of the fourth clamping screw 22, since the first blocking structure 12 and the first baffle 14 can both move along the first direction, and the second blocking structure 13 and the second baffle 15 can both move along the first direction, the test fixture can clamp samples to be tested of different sizes more stably, and can flexibly adjust the clamping position according to the size of the sample to be tested, thereby greatly improving the applicability of the test fixture.

[0043] As a possible implementation, the connection structure includes a connecting screw 25 and a matching nut 26. The base 113 is further provided with a fifth through-hole 27. One end of the connecting screw is connected to the fifth through-hole 27, and the nut 26 is connected to the connecting screw 25. The connecting screw 25 and the matching nut 26 ensure that the connection structure is always in a stable state during the tensile test, ensuring that the tensile force applied to the entire test fixture is always in the vertical direction.

[0044] As a possible implementation, Figure 3 As shown, the center of the projection of the connecting structure 25 on the base 113 is located between the projections of the first blocking structure 12 and the second blocking structure 13 on the base 113. During the process of adjusting at least one of the first blocking structure 12, the second blocking structure 13, the first baffle 14, and the second baffle 15, the center of the sample to be tested is adjusted to be coaxial with the connecting structure 25. Since the center of the projection of the connecting structure 25 on the base 113 is located between the projections of the first blocking structure 12 and the second blocking structure 13 on the base 113, in this state, the force applied to the sample to be tested is more uniform, indirectly improving the accuracy of the tensile test.

[0045] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A test fixture, characterized in that: The invention comprises two clamping structures (1), wherein the clamping structure (1) comprises: The clamping outer frame (11) comprises a first support (111), a second support (112) and a base (113); the first support (111) and the second support (112) are located on the same side of the base (113) and are connected to the base (113); A first blocking structure (12) is provided in the clamping outer frame (11) and is connected to the base (113); A second blocking structure (13) is provided in the clamping outer frame (11) and is connected to the base (113); a first baffle (14) connected to the first pillar (111), the first baffle (14) being disposed between the first pillar (111) and the first blocking structure (12), and being movable along a first direction, the first direction being a direction in which the first blocking structure (12) and the first baffle (14) are relatively disposed; a second baffle (15) connected to the second pillar (112), the second baffle (15) being disposed between the second pillar (112) and the second blocking structure (13) and being movable along the first direction; The connecting structure (16) is arranged outside the clamping outer frame (11) and is connected to the base (113).

2. The test fixture according to claim 1, wherein: The test fixture further comprises a first compression screw (17) and a second compression screw (18); A first through hole (171) is provided on the first pillar (111), a first mounting threaded hole (141) is provided on a surface of the first baffle (14) close to the first pillar (111), the first pressing screw (17) passes through the first through hole (171), and one end of the first pressing screw (17) is threadedly connected to the first mounting threaded hole (141); A second through hole (181) is provided on the second pillar (112), a second mounting threaded hole (151) is provided on the surface of the second baffle (15) close to the second pillar (112), the second clamping screw (18) passes through the second through hole (181), and one end of the second clamping screw (18) is threadedly connected to the second mounting threaded hole (151).

3. The test fixture according to claim 2, wherein: The test fixture further comprises a first fastening post (19) and a second fastening post (20); A first fastening hole is provided on a side surface of the first baffle (14), and the side surface of the first baffle (14) is parallel to the extension direction of the first pressing screw (17); the first fastening hole is communicated with the first mounting threaded hole (141), and the first fastening column (19) can be inserted into the first fastening hole; A second fastening hole is provided on the side surface of the second baffle (15), and the side surface of the second baffle (15) is parallel to the extension direction of the second pressing screw (18); the second fastening hole is connected to the second mounting threaded hole (151), and the second fastening column (20) can be inserted into the second fastening hole.

4. The test fixture according to claim 1, wherein: The test fixture further comprises a third pressing screw (21) and a fourth pressing screw (22); a third through hole (114) and a fourth through hole (115) are provided on the base (113); a third mounting threaded hole (121) is provided on a surface of the first blocking structure (12) close to the base (113); and a fourth mounting threaded hole (131) is provided on a surface of the second blocking structure (13) close to the base (113); The third clamping screw (21) passes through the third through hole (114), and one end of the third clamping screw (21) is threadedly connected to the third mounting threaded hole (121). The fourth clamping screw (22) passes through the fourth through hole (115), and one end of the fourth clamping screw (22) is threadedly connected to the fourth mounting threaded hole (131).

5. The test fixture according to claim 4, wherein: The test fixture further comprises a third fastening column (23) and a fourth fastening column (24); A third fastening hole is provided on the side surface of the first blocking structure (12), the side surface of the first blocking structure (12) is parallel to the extension direction of the third pressing screw (21), the third fastening hole is connected to the third mounting threaded hole (121), and the third fastening column (23) can be inserted into the third fastening hole; A fourth fastening hole is provided on the side surface of the second blocking structure (13), the side surface of the second blocking structure (13) is parallel to the extension direction of the fourth pressing screw (22), the fourth fastening hole is connected to the fourth mounting threaded hole (131), and the fourth fastening column (24) can be inserted into the fourth fastening hole.

6. The test fixture according to claim 4, wherein: The size of the third through hole (114) in the first direction is greater than or equal to the size of the third pressing screw (21).

7. The test fixture according to claim 4, wherein: The size of the fourth through hole (115) in the first direction is greater than or equal to the size of the fourth pressing screw (22).

8. The test fixture according to claim 1, wherein: The connecting structure (16) includes a connecting screw (25) and a matching nut (26), and the base (113) is further provided with a fifth through hole (27); One end of the connecting screw (25) is connected to the fifth through hole (27), and the nut (26) is connected to the connecting screw (25).

9. The test fixture according to any one of claims 1 to 7, characterized in that: At least one of the first blocking structure (12), the second blocking structure (13), the first baffle (14) and the second baffle (15) is provided with anti-slip stripes (28).

10. The test fixture according to any one of claims 1 to 7, characterized in that: The center of the projection of the connecting structure (16) on the base (113) is located between the projections of the first blocking structure (12) and the second blocking structure (13) on the base (113).

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