Test fixture

Abstract

The utility model belongs to the technical field of electronic component testing, and discloses a testing jig which comprises a testing base and a testing mechanism. The testing mechanism comprises two testing parts and a connecting seat arranged on the testing base; the two testing parts are arranged on the connecting base at intervals, a product to be tested is located between the two testing parts, each testing part comprises a shell, a steering arm, a rotating shaft and a testing probe, the rotating shaft is fixedly connected to the shell, the steering arm is rotationally connected to the rotating shaft and can rotate around the rotating shaft, and the rotating shaft is arranged in the middle of the steering arm in the length direction of the rotating shaft; the test probes are connected to one end of the steering arm along the length direction of the steering arm, the rotation of the steering arm can drive the test probes to move relative to the shell, so that the two test probes are close to each other or far away from each other, and the two test probes can abut against a to-be-tested product and test the to-be-tested product when being close to each other. According to the utility model, the universality and practicability of the test fixture can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic component testing, in particular to a testing fixture. Background Art

[0002] When the current testing fixture tests a product to be tested, for example, when testing the current inductance and zero ampere inductance of products such as current sensors, current transformers or inductors, a testing fixture usually can only be applicable to products to be tested with corresponding shapes and sizes. The testing fixture has high pertinence and low adaptability. However, due to the increasing variety of products on the market, if such highly targeted testing fixtures are used, multiple testing fixtures need to be designed and manufactured for products to be tested with different shapes and sizes, resulting in high production costs. The versatility and practicality of the testing fixture are low, and it is difficult to meet the actual use requirements.

[0003] Therefore, it is urgent to propose a testing fixture to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a testing fixture, which can improve the versatility and practicality of the testing fixture.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The utility model provides a testing fixture, which includes a testing base and a testing mechanism. The testing mechanism is arranged on the testing base and is electrically connected to the testing base; the testing mechanism includes:

[0007] A connecting seat, which is arranged on the testing base;

[0008] Two testing parts, the two testing parts are arranged on the connecting seat at intervals, the product to be tested is located between the two testing parts, and each testing part includes a housing, a steering arm, a rotating shaft and a testing probe. The rotating shaft is fixedly connected to the housing, the steering arm is rotatably connected to the rotating shaft and can rotate around the rotating shaft. The rotating shaft is arranged at the middle position of the steering arm along its own length direction. The testing probe is connected to one end of the steering arm along its own length direction. The rotation of the steering arm can drive the testing probe to move relative to the housing, so that the two testing probes approach or move away from each other. When the two testing probes approach each other, they can abut against the product to be tested and conduct testing.

[0009] In some embodiments, an elastic member is sleeved on the test probe, a stop portion is provided on the housing, one end of the elastic member is connected to the test probe, and the other end of the elastic member is connected to or abuts against the stop portion, so that when the two test probes move away from each other, the elastic member is stopped by the stop portion and is in a compressed state.

[0010] In some embodiments, the test probe includes a first segment and a second segment connected to each other. The first segment and the second segment are coaxially arranged. The first segment is configured to abut against the product to be tested and the diameter of the first segment is larger than that of the second segment. The elastic member is sleeved on the second segment. One end of the elastic member abuts against the end face of the first segment on the side close to the second segment, and the other end of the elastic member abuts against the stop portion.

[0011] In some embodiments, a guiding hole is formed inside the housing. The guiding hole penetrates the housing and extends in the horizontal direction. At least a part of the test probe is slidably connected inside the guiding hole; a fixing screw is provided between the steering arm and the test probe. A kidney-shaped hole is formed in the steering arm. One end of the fixing screw is slidably sleeved in the kidney-shaped hole, and the other end of the fixing screw is threadedly locked with the test probe. A part of the fixing screw is arranged inside the housing and is configured to move inside the housing.

[0012] In some embodiments, the guiding hole includes a first hole and a second hole. A part of the first segment slides inside the first hole, and a part of the second segment slides inside the second hole. An avoidance cavity is further provided inside the housing. The avoidance cavity is located between the first hole and the second hole and is communicated with both the first hole and the second hole. The aperture of the second hole is smaller than the outer diameter of the elastic member. The fixing screw is configured to move inside the avoidance cavity.

[0013] In some embodiments, a fixing block is further sleeved and connected on the test probe. One end of the fixing screw passes through the inside of the fixing block and is threadedly locked with the test probe.

[0014] In some embodiments, along the moving direction of the test probe, two opposite outer surfaces of the fixing block are provided as abutting planes, and the two abutting planes can abut against the inner wall of the avoidance cavity.

[0015] In some embodiments, the central axis of the fixing screw is parallel to the central axis of the rotating shaft, and the central axes of the fixing screw and the rotating shaft are both perpendicular to the steering arm.

[0016] In some embodiments, the connecting seat is detachably connected to the test base; a profiling block is arranged between the two test parts, the profiling block is detachably connected to the connecting seat, and a profiling groove for placing the product to be tested is formed on the profiling block.

[0017] In some embodiments, an insulating sleeve is arranged outside the housing, and the insulating sleeve covers the outer surface of the housing.

[0018] Advantages of the present utility model:

[0019] The test fixture provided by the present utility model sets the two test probes in a form that can approach or move away from each other, so that the distance between the two test probes can be adjusted according to the size specifications of the product to be tested. Furthermore, the two test probes can be applicable to products to be tested with different size specifications, improving the versatility and practicability of the test fixture. Description of the drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments of the present utility model. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0021] Figure 1 is a three-dimensional structural schematic diagram of the test fixture provided by the embodiment of the present utility model;

[0022] Figure 2 is a three-dimensional structural schematic diagram of the test fixture from another perspective provided by the embodiment of the present utility model;

[0023] Figure 3 is a top view structural schematic diagram of the test fixture provided by the embodiment of the present utility model;

[0024] Figure 4 is an internal structural schematic diagram of the test mechanism provided by the embodiment of the present utility model;

[0025] Figure 5 is an exploded structural schematic diagram of the test mechanism provided by the embodiment of the present utility model;

[0026] Figure 6 is an assembly structural schematic diagram of the steering arm, the rotating shaft and the test probe from one perspective provided by the embodiment of the present utility model;

[0027] Figure 7 is an assembly structural schematic diagram of the steering arm, the rotating shaft and the test probe from another perspective provided by the embodiment of the present utility model;

[0028] Figure 8 This is a schematic exploded view of a steering arm, a rotating shaft, and a test probe provided by an embodiment of the present utility model;

[0029] Figure 9 This is a schematic structural view of a profiling block provided by an embodiment of the present utility model.

[0030] In the figure:

[0031] 1. Connecting seat;

[0032] 2. Testing part; 21. Housing; 211. Stopping part; 212. Guide hole; 2121. First hole; 2122. Second hole; 213. Avoidance cavity; 22. Steering arm; 221. Waist-shaped hole; 23. Rotating shaft; 24. Test probe; 241. First segment; 2411. End face; 242. Second segment;

[0033] 3. Profiling block; 31. Profiling groove;

[0034] 4. Product to be tested;

[0035] 5. Elastic member;

[0036] 6. Fixing screw;

[0037] 7. Fixing block; 71. Contact plane;

[0038] 8. Insulating sleeve;

[0039] 100. Test base; 110. Banana connector; 120. Overcurrent copper sheet metal; 130. BNC connector; 200. Test mechanism. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0042] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, 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 therefore should not be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0044] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. 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.

[0045] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0046] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the figures, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are only used to explain the present utility model and should not be construed as a limitation on the present utility model.

[0047] As Figures 1 to 9 shown, the test fixture provided in this embodiment includes a test base 100 and a test mechanism 200. The test mechanism 200 is arranged on the test base 100 and is electrically connected to the test base 100.

[0048] The test mechanism 200 includes a connecting base 1 and two test parts 2. The connecting base 1 is arranged on the test base 100. The two test parts 2 are arranged on the connecting base 1 at intervals, and the product under test 4 is located between the two test parts 2. Each test part 2 includes a housing 21, a steering arm 22, a rotating shaft 23 and a test probe 24. The rotating shaft 23 is fixedly connected to the housing 21, the steering arm 22 is rotatably connected to the rotating shaft 23 and can rotate around the rotating shaft 23. The rotating shaft 23 is arranged at the middle position of the steering arm 22 along its own length direction. The test probe 24 is connected to one end of the steering arm 22 along its own length direction. The rotation of the steering arm 22 can drive the test probe 24 to move relative to the housing 21, so that the two test probes 24 approach each other or move away from each other. When the two test probes 24 approach each other, they can abut against the product under test 4 and conduct a test.

[0049] For the convenience of description, taking the orientation in Figure 3 as an example, when it is necessary to test the product under test 4, first, the user holds the ends of the two steering arms 22 where the test probes 24 are not arranged, and rotates the two ends on the two steering arms 22 inward around the rotating shaft 23 at the same time. The ends of the two steering arms 22 where the test probes 24 are arranged will rotate outward at the same time accordingly. Eventually, the two test probes 24 move away from each other, reserving enough installation space for the product under test 4. At this time, the product under test 4 is placed between the two test parts 2, and then the ends of the two steering arms 22 where the test probes 24 are not arranged are rotated outward around the rotating shaft 23 at the same time, so as to drive the ends of the steering arms 22 where the test probes 24 are arranged to rotate inward at the same time, and further make the two test probes 24 approach each other until the two test probes 24 abut against the test parts on the product under test 4, and the test starts.

[0050] Exemplarily, the product under test 4 includes but is not limited to a current sensor, a current transformer or an inductor, etc. During specific testing, the banana connectors 110, the overcurrent copper sheet metal 120 and the BNC connectors 130 on the test base 100 are jointly connected to an instrument to test the current addition inductance, zero ampere inductance, etc. of the product under test 4. When the instrument controls to supply current, the current addition inductance of the product under test 4 is measured, and when the instrument controls not to supply current, the zero ampere inductance of the product under test 4 is measured. The specific test principle and operation process are mature existing technologies in this field and will not be elaborated here.

[0051] The test fixture provided in this embodiment makes the distance between the two test probes 24 adjustable according to the size specification of the product under test 4 by setting the two test probes 24 to be able to approach each other or move away from each other, so that the two test probes 24 can be applicable to products under test 4 with different size specifications, improving the versatility and practicability of the test fixture.

[0052] Optionally, the two test parts 2 are symmetrically arranged on the connecting base 1.

[0053] As Figures 1 to 3 , Figure 9 shown, in some embodiments, the connecting base 1 is detachably connected to the test base 100; a profiling block 3 is arranged between the two test parts 2, the profiling block 3 is detachably connected to the connecting base 1, and a profiling groove 31 for placing the product 4 to be tested is formed on the profiling block 3.

[0054] By providing the profiling block 3, the stability of the installation of the product 4 to be tested can be ensured. Moreover, the detachable setting of the profiling block 3 enables the user to replace the profiling block 3 for products with similar shapes but only different size specifications, so that products 4 to be tested with different size specifications can be stably supported under the action of the profiling block 3. In addition, since the connecting base 1 is detachably connected to the test base 100, that is, the entire test mechanism 200 is detachably connected to the test base 100. In this way, when replacing different types of products 4 to be tested, only the test mechanism 200 needs to be disassembled and replaced, and the test base 100 can be universal. That is: the test fixture can be better applicable to products 4 to be tested with different size specifications and different types, further improving the versatility and practicality of the test fixture.

[0055] It should be noted that: different types of products 4 to be tested include but are not limited to different arrangements of the test parts on the product 4 to be tested. For example, as Figure 3 and Figure 4 shown, the test parts on the product 4 to be tested are symmetrically distributed on the opposite sides of the product 4 to be tested. For example, the product 4 to be tested includes a magnetic body and a conductor at least partially disposed in the magnetic body, and the exposed part of the conductor outside the magnetic core can be the test part; wherein, the conductor is symmetrically exposed outside the magnetic core from the opposite sides of the magnetic core. At this time, the two test probes 24 on the test mechanism 200 are oppositely arranged and extend along the same straight line. If the product 4 to be tested is replaced with a form in which the test parts are misaligned, for example, along the length direction of the product 4 to be tested, the two test parts are spaced apart at the opposite ends of the product 4 to be tested. At this time, the test mechanism 200 needs to be disassembled and replaced, and the two test probes 24 on the replaced test mechanism 200 are also misaligned, that is, the extension lines of the two test probes 24 are parallel to each other but do not coincide.

[0056] Optionally, the connecting base 1 is detachably connected to the copper connecting block on the test base 100 through bolts, screws, etc., so as to realize the detachable connection between the test mechanism 200 and the test base 100. As Figure 4 shown, in some embodiments, an insulating sleeve 8 is arranged outside the housing 21, and the insulating sleeve 8 covers the outer surface of the housing 21. The setting of the insulating sleeve 8 can isolate the current, avoid electric shock to the user, and improve safety.

[0057] Among them, the insulating sleeve 8 can be made of materials such as rubber or polypropylene, and specific limitations are not made here.

[0058] As Figure 4 and Figure 6 shown, in some embodiments, an elastic member 5 is sleeved on the test probe 24, a stop portion 211 is provided on the housing 21, one end of the elastic member 5 is connected to the test probe 24, and the other end of the elastic member 5 is connected to or abuts against the stop portion 211, so that when the two test probes 24 move away from each other, the elastic member 5 is blocked by the stop portion 211 and is in a compressed state.

[0059] With such a setting, when the two test probes 24 move away from each other, the elastic member 5 is compressed and stores elastic force. After the product 4 to be tested is placed properly, the user only needs to release the steering arm 22. At this time, the shape of the elastic member 5 is restored, and the two test probes 24 can automatically approach each other under the elastic force of the elastic member 5 until they abut against the product 4 to be tested, making the operation more convenient; moreover, the elastic force of the elastic member 5 can apply a certain pressure to the test probe 24 to the product 4 to be tested, which is beneficial to keeping the stable contact between the test probe 24 and the product 4 to be tested. It can be understood that the elastic member 5 can also have the function of conducting electricity. Specifically, after the test mechanism 200 is connected to the test base 100, the copper connecting block on the test base 100 is electrically connected to the housing 21, and the housing 21 is electrically connected to the test probe 24. During the test, the current passes through the copper sheet metal 120 on one side and passes through the corresponding copper connecting block, housing 21, elastic member 5, test probe 24; then passes through the product 4 to be tested to the test probe 24 on the other side, and finally reaches the copper sheet metal 120 on the other side to form a current loop. Of course, in other embodiments, the current can directly pass from the corresponding copper connecting block, housing 21, test probe 24 to the product 4 to be tested without passing through the elastic member 5. Among them, the housing 21, elastic member 5, test probe 24 and the structure connected and cooperated with the test probe 24 can be adjusted and set according to specific situations to form a conduction path.

[0060] Further, as Figure 4 and Figure 8 shown, the test probe 24 includes a first segment 241 and a second segment 242 connected to each other. The first segment 241 and the second segment 242 are coaxially arranged. The first segment 241 is configured to abut against the product 4 to be tested and the diameter of the first segment 241 is larger than that of the second segment 242. The elastic member 5 is sleeved on the second segment 242. One end of the elastic member 5 abuts against the end face 2411 on the side of the first segment 241 close to the second segment 242, and the other end of the elastic member 5 abuts against the stop portion 211. With such a setting, the end face 2411 of the first segment 241 plays a certain limiting role on the elastic member 5, facilitating the positioning and installation of the elastic member 5.

[0061] The elastic member 5 can be configured as a spring or a coil spring, which is not specifically limited here.

[0062] like Figure 4 and Figure 7 As shown, in some embodiments, a guide hole 212 is defined within the housing 21. The guide hole 212 extends horizontally through the housing 21, and the test probe 24 is at least partially slidably connected within the guide hole 212. A fixing screw 6 is disposed between the steering arm 22 and the test probe 24. The steering arm 22 defines a waist-shaped hole 221. One end of the fixing screw 6 is slidably inserted into the waist-shaped hole 221, and the other end of the fixing screw 6 is threadedly locked with the test probe 24. The fixing screw 6 is partially disposed within the housing 21 and is configured to move within the housing 21.

[0063] This arrangement, in which the test probe 24 is positioned within the housing 21, facilitates a more compact overall structure. The housing 21 also provides some protection for the test probe 24. Furthermore, the waist-shaped hole 221 and the guide hole 212 cooperate to allow the test probe 24 to move linearly in the horizontal direction. Furthermore, the connection between the steering arm 22 and the test probe 24 is achieved by providing a set screw 6, making installation and removal easier and facilitating subsequent maintenance and replacement of various components.

[0064] During specific implementation, as the steering arm 22 rotates, one end of the fixing screw 6 slides within the waist-shaped hole 221, ultimately causing the test probe 24 to move linearly in the horizontal direction within the guide hole 212. This ensures that the test probe 24 is aligned with and effectively contacts the test portion of the product 4 under test, preventing the test probe 24 from tilting and causing poor contact, which could affect the test results. If the waist-shaped hole 221 is not provided, or if one end of the fixing screw 6 is fixed in place within the waist-shaped hole 221, then, since the end of the steering arm 22 moves in an arc as it rotates, the test probe 24 also moves in an arc, which is not conducive to effective contact between the test probe 24 and the product 4 under test.

[0065] Further, if Figure 4 As shown, the guide hole 212 includes a first hole 2121 and a second hole 2122, the first segment 241 partially slides inside the first hole 2121, and the second segment 242 partially slides inside the second hole 2122. An avoidance cavity 213 is also provided inside the shell 21, and the avoidance cavity 213 is located between the first hole 2121 and the second hole 2122, and is connected to both the first hole 2121 and the second hole 2122. The aperture of the second hole 2122 is smaller than the outer diameter of the elastic member 5, and the fixing screw 6 is configured to move in the avoidance cavity 213.

[0066] With such a setting, when the two test probes 24 move away from each other, the elastic member 5 can be stopped at the orifice of the second hole 2122 near the first hole 2121. At this time, this orifice is the stop portion 211, and there is no need to additionally provide the stop portion 211, which is beneficial to simplifying the structure. In addition, an avoidance cavity 213 is provided between the first hole 2121 and the second hole 2122. Compared with the adjacent arrangement of the first hole 2121 and the second hole 2122, the avoidance cavity 213 is beneficial to increasing the movable distance of the test probe 24 and has higher flexibility.

[0067] In some embodiments, the central axis of the fixing screw 6 is parallel to the central axis of the rotating shaft 23, and the central axes of the fixing screw 6 and the rotating shaft 23 are both perpendicular to the steering arm 22. With such a setting, the design and manufacture can be made more concise, reducing the possible mutual interference between components. Moreover, the perpendicular arrangement of the fixing screw 6 and the rotating shaft 23 with the steering arm 22 is beneficial to keeping the steering arm 22 stable during rotation and reducing unnecessary shaking.

[0068] As Figures 6 to 8 shown, in some embodiments, a fixing block 7 is also sleeved and connected to the test probe 24, and one end of the fixing screw 6 passes through the inside of the fixing block 7 and is threadedly locked with the test probe 24. With such a setting, the fixing block 7 forms a wrap outside the connection between the fixing screw 6 and the test probe 24, which is beneficial to protecting the stable connection between the fixing screw 6 and the test probe 24.

[0069] Further, as Figures 6 to 8 shown, along the moving direction of the test probe 24, two opposite outer surfaces of the fixing block 7 are set as abutting planes 71, and the two abutting planes 71 can abut against the inner wall of the avoidance cavity 213.

[0070] With such a setting, when the two test probes 24 approach each other, one of the abutting planes 71 can abut against the inner wall of the avoidance cavity 213 near the product under test 4, avoiding damage to the product under test 4 caused by the excessive moving distance of the test probe 24; when the two test probes 24 move away from each other, the other abutting plane 71 can abut against the inner wall of the avoidance cavity 213 far from the product under test 4, avoiding excessive compression of the elastic member 5 due to the excessive moving distance of the test probe 24 and resulting in a decrease in elastic performance. That is: the two abutting planes 71 cooperate with the inner wall of the avoidance cavity 213 to provide a limiting effect on the movement of the test probe 24. In addition, the fixing block 7 can also prevent the fixing screw 6 or the test probe 24 from directly colliding with the inner wall of the avoidance cavity 213, which is beneficial to extending the service life of the product.

[0071] Obviously, the above embodiments of the present utility model are only examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Test fixture, characterized in that, It includes a test base (100) and a test mechanism (200). The test mechanism (200) is disposed on the test base (100) and electrically connected to the test base (100). The test mechanism (200) includes: A connecting seat (1) disposed on the test base (100); Two test parts (2). The two test parts (2) are spaced apart on the connecting seat (1). The product to be tested (4) is located between the two test parts (2). Each test part (2) includes a housing (21), a steering arm (22), a rotating shaft (23) and a test probe (24). The rotating shaft (23) is fixedly connected to the housing (21). The steering arm (22) is rotatably connected to the rotating shaft (23) and can rotate around the rotating shaft (23). The rotating shaft (23) is disposed at the middle position of the steering arm (22) along its own length direction. The test probe (24) is connected to one end of the steering arm (22) along its own length direction. The rotation of the steering arm (22) can drive the test probe (24) to move relative to the housing (21), so that the two test probes (24) approach or move away from each other. When the two test probes (24) approach each other, they can abut against the product to be tested (4) and perform a test.

2. The test fixture according to claim 1, wherein An elastic member (5) is sleeved on the test probe (24). A stop portion (211) is provided on the housing (21). One end of the elastic member (5) is connected to the test probe (24), and the other end of the elastic member (5) is connected to or abuts against the stop portion (211), so that when the two test probes (24) move away from each other, the elastic member (5) is blocked by the stop portion (211) and is in a compressed state.

3. The test fixture according to claim 2, wherein The test probe (24) includes a first segment (241) and a second segment (242) connected to each other. The first segment (241) and the second segment (242) are coaxially arranged. The first segment (241) is configured to abut against the product to be tested (4) and the diameter of the first segment (241) is larger than the diameter of the second segment (242). The elastic member (5) is sleeved on the second segment (242). One end of the elastic member (5) abuts against the end face (2411) of the first segment (241) on the side close to the second segment (242), and the other end of the elastic member (5) abuts against the stop portion (211).

4. The test fixture according to claim 3, wherein A guiding hole (212) is formed inside the housing (21). The guiding hole (212) penetrates the housing (21) and extends in the horizontal direction. At least a part of the test probe (24) is slidably connected inside the guiding hole (212). A fixing screw (6) is arranged between the steering arm (22) and the test probe (24). A waist-shaped hole (221) is formed in the steering arm (22). One end of the fixing screw (6) is slidably sleeved in the waist-shaped hole (221), and the other end of the fixing screw (6) is threadedly locked with the test probe (24). A part of the fixing screw (6) is arranged inside the housing (21) and is configured to move inside the housing (21).

5. The test fixture according to claim 4, wherein the guiding hole (212) includes a first hole (2121) and a second hole (2122). A part of the first segment (241) slides inside the first hole (2121), and a part of the second segment (242) slides inside the second hole (2122). An avoidance cavity (213) is further arranged inside the housing (21). The avoidance cavity (213) is located between the first hole (2121) and the second hole (2122) and is communicated with both the first hole (2121) and the second hole (2122). The aperture of the second hole (2122) is smaller than the outer diameter of the elastic member (5). The fixing screw (6) is configured to move inside the avoidance cavity (213).

6. The test fixture according to claim 5, wherein a fixing block (7) is further sleeved and connected to the test probe (24). One end of the fixing screw (6) passes through the inside of the fixing block (7) and is threadedly locked with the test probe (24).

7. The test fixture according to claim 6, wherein along the moving direction of the test probe (24), two opposite outer surfaces of the fixing block (7) are arranged as abutting planes (71), and the two abutting planes (71) can abut against the inner wall of the avoidance cavity (213).

8. The test fixture according to claim 4, wherein the central axis of the fixing screw (6) is parallel to the central axis of the rotating shaft (23), and the central axes of the fixing screw (6) and the rotating shaft (23) are both perpendicular to the steering arm (22).

9. The test fixture according to any one of claims 1 to 8, wherein the connecting seat (1) is detachably connected to the test base (100); a profiling block (3) is arranged between the two test parts (2). The profiling block (3) is detachably connected to the connecting seat (1), and a profiling groove (31) for placing the product under test (4) is formed in the profiling block (3).

10. The test fixture according to any one of claims 1 to 8, wherein an insulating sleeve (8) is arranged outside the housing (21), and the insulating sleeve (8) covers the outer surface of the housing (21).

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