A test fixture

Abstract

The present application discloses a test fixture, which includes a bottom box, a lower needle plate, a tray, a flip cover, an upper needle plate and a plurality of needle group adjustment mechanisms. The test fixture can be used to test circuit boards, and the test fixture of the present application is designed in a flip cover form, which can facilitate product placement and retrieval and adjustment of the position of the lower needle group. The upper needle group and the lower needle group are both installed by the needle group adjustment mechanism, and the needle group can be adjusted in the up and down directions and the horizontal direction, so as to adapt to the testing requirements of different products. After the product test is completed, the product can be taken out by opening the flip cover, which is simple, fast and flexible.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a test fixture. Background Art

[0002] According to the purpose and required characteristics of the circuit board, the circuit board obtained after installing various components such as resistors, integrated circuits, capacitors and transformers is called a circuit board assembly, often abbreviated PCBA (Printed Circuit Board Assembly) in English. Before installing PCBA on the product, some functional tests are usually carried out to ensure that the function itself is normal and that the product can work normally after being installed on the product. When the PCB is functionally tested, a test fixture is required. This fixture can be directly connected to the product with wires (terminals). This is relatively low in cost, but slow and requires a lot of workload for the operator. If the order volume is relatively large, a test fixture is generally made. It touches the points on the PCB that need to be connected to the outside with probes and connects to the test equipment through some interfaces. The fixture can quickly connect the product and improve production efficiency.

[0003] In the prior art, there are two methods: plug-in functional test fixtures and dedicated functional test fixtures. Among them, (1) plug-in functional test fixtures: all wires must be connected manually, the connection time is long, the operation intensity is high, the test efficiency is low, and it can only be used for small batch production or non-mass production testing;

[0004] (2) Special functional test fixture: The position of the probe is fixed and cannot be universal. A special fixture must be made for each product, which has high fixture costs. Utility Model Content

[0005] The embodiment of the present application provides a test fixture, which can adjust the position of the needle group according to actual needs, has a flexible structure, and is easy to operate.

[0006] The embodiment of the present application discloses a test fixture, including a bottom box, a lower needle plate, a tray, a flip cover, an upper needle plate and a plurality of needle group adjustment mechanisms; the bottom box is arranged on a working surface; the lower needle plate is arranged on the bottom box; the tray is arranged on the lower needle plate for mounting the product to be tested; the flip cover is hinged with the lower needle plate and can be rotatably covered directly above the lower needle plate; the upper needle plate is stacked above the flip cover; both the upper needle plate and the lower needle plate are provided with sliding holes along a first horizontal direction, and both the upper needle plate and the lower needle plate are provided with a needle group adjustment mechanism; the needle group adjustment mechanism includes a bolt and nut combination, a T-block, a slider and an adjusting bolt; the bolt and nut combination passes through the sliding hole, and the bolt and nut combination is connected to the T-block, and the bolt and nut combination is used to fix the T-block to the upper needle plate or the lower needle plate together; the slider is slidably arranged on the T-block along the height direction; the adjusting bolt is rotatably arranged on the T-block, and the adjusting bolt is threadedly connected to the slider; the lower needle group and the upper needle group for testing the product are respectively connected to the sliders of the plurality of needle group adjustment mechanisms.

[0007] The test fixture of the present application has at least the following beneficial effects:

[0008] The test fixture of the present application includes a base box, a lower needle plate, a tray, a flip cover, an upper needle plate and multiple needle group adjustment mechanisms. The test fixture can be used to test circuit boards, and the test fixture of the present application is designed in a flip cover form, which can be convenient for taking and placing products and adjusting the position of the lower needle group. The upper needle group and the lower needle group are both installed by the needle group adjustment mechanism, and the needle group can be adjusted in the up and down directions and horizontal direction (first horizontal direction) to adapt to the testing requirements of different products. After the product test is completed, the product can be taken out by opening the flip cover, which is simple, fast and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0010] Figure 1 is a top view of a test fixture according to an embodiment of the present application;

[0011] Figure 2 yes Figure 1 AA view in;

[0012] Figure 3 is a structural diagram of a test fixture according to an embodiment of the present application;

[0013] Figure 4 is an exploded view of a test fixture according to an embodiment of the present application;

[0014] Figure 5 It is a schematic diagram of the structure of the bottom box, the lower needle plate, the tray and the lower needle group;

[0015] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0016] Figure 7 It is a schematic diagram of the structure of the flap, the upper needle plate and the upper needle group;

[0017] Figure 8 yes Figure 2 The enlarged view of point B in the middle;

[0018] Fig. 9 It is a structural schematic diagram of the lower needle plate, the needle group adjustment mechanism and the lower needle group;

[0019] Fig.10 It is a partial schematic diagram of the needle group adjustment mechanism and the lower needle group;

[0020] Fig.11 yes Fig.10 Another angle view of

[0021] Description of the reference numerals is as follows:

[0022] 1. Bottom box;

[0023] 2. Lower needle plate; 21. First connecting member; 22. First elastic member;

[0024] 3. tray; 31. tray body; 31a. first mounting hole; 32. connecting plate; 32a. waist-shaped hole; 33. positioning pin; 34. first connecting bolt;

[0025] 4. flip cover; 41. limit column; 42. second connecting member; 43. second elastic member; 44. side block;

[0026] 5. Upper needle plate;

[0027] 6. Needle group adjustment mechanism; 61. Bolt and nut combination; 62. T-shaped block; 63. Sliding block; 64. Adjusting bolt; 6a. First guide groove; 6b. Second mounting hole; 6c. Second guide groove; 65. Guide member; 7. Lower needle group;

[0028] 8. Needle upper group;

[0029] 9. buckle mechanism; 91. buckle tongue; 92. base;

[0030] P: Sliding hole. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The embodiment of the present application discloses a test fixture, which is used to test a PCB (printed circuit board).

[0034] like Figures 1 to 4 As shown, the test fixture includes a bottom box 1, a lower needle plate 2, a tray 3, a flip cover 4, an upper needle plate 5 and a plurality of needle group adjustment mechanisms 6, wherein the bottom box 1 serves as a bottom support mechanism to provide an installation basis for other parts, the lower needle plate 2 is used to install the tray 3 and the lower needle group 7, the tray 3 is used to carry the product to be tested (i.e., the circuit board), the lower needle group 7 is used to test the product, the flip cover 4 can be flipped up or rotated to cover the top of the lower needle plate 2, the upper needle plate 5 is arranged on the flip cover 4, and can rotate with the flip cover 4, the upper needle group 8 is arranged on the upper needle plate 5, and the upper needle group 8 is used to test the product. During the test, the upper needle group 8 and the lower needle group 7 are respectively contacted with the product for testing, and the upper needle group 8 and the lower needle group 7 are both installed on the upper needle plate 5 or the lower needle plate 2 through the needle group adjustment mechanism 6, and the needle group adjustment mechanism 6 can facilitate the adjustment of the needle group (i.e., the upper needle group 8 and the lower needle group 7) in the first horizontal direction and the height direction. The needle group used for product testing in the embodiment of the present application can refer to the prior art. The needle group (specifically, the probe of the needle group) can be extended and retracted in the height direction, that is, the probe has a certain extension stroke.

[0035] First, the direction of the embodiment of the present application is defined as follows: Figure 1 As shown, the first horizontal direction and the second horizontal direction are perpendicular to each other in the horizontal plane.

[0036] The specific structure of the test fixture is as follows:

[0037] The bottom box 1 is in the shape of a hollow square. Figure 5 As shown, the top of the bottom box 1 is open, and a plurality of legs are provided at the bottom to support the work surface (such as the ground, etc.). The side wall of the bottom box 1 is also provided with a plurality of windows to facilitate the subsequent adjustment of the needle group adjustment mechanism 6.

[0038] The lower needle plate 2 is a flat plate structure. Figure 5 As shown, the lower needle plate 2 is horizontally arranged on the bottom box 1 , and the lower needle plate 2 can provide an installation position for the tray 3 and the lower needle group 7 .

[0039] The tray 3 is horizontally arranged just above the lower needle plate 2 and is used to mount the product to be tested. Figure 5 and Figure 6 As shown, the specific arrangement is: the lower needle plate 2 is provided with a first connecting member 21 at both ends of the second horizontal direction, the first connecting member 21 is arranged vertically upward, and the tray 3 is provided with a first guide hole (not marked) at both ends, and the first guide hole is coaxially sleeved on the outer periphery of the first connecting member 21, so that the tray 3 can slide up and down in the height direction relative to the lower needle plate 2. A first elastic member 22 (such as a spring, etc.) is provided between the lower needle plate 2 and the tray 3. The first elastic member 22 is coaxially sleeved on the outer periphery of the first connecting member 21. The telescopic direction of the first elastic member 22 is configured as the axial direction (i.e., the height direction) of the first connecting member 21. The first elastic member 22 is provided so that the tray 3 and the product to be tested can have a certain floating stroke in the height direction. When the tray 3 and the product are pressed down, the product can press the probe of the lower needle group 7, thereby detecting the telescopic stroke of the probe. The contact pressure between the probe and the product can be selected according to different products or test requirements. Among them, because the lower needle group 7 is provided on the lower needle plate 2 by the needle group adjustment mechanism 6, the position of the lower needle group 7 can be adjusted by the needle group adjustment mechanism 6, thereby adjusting the contact pressure. Another advantage of providing the first elastic member 22 is that the position of the tray 3 and the product can float, which can avoid rigid contact between the product and other components, thereby avoiding product damage. In the embodiment of the present application, the first connecting member 21 can refer to existing threaded members such as semi-threaded bolts, which will not be repeated here.

[0040] The tray 3 includes a tray body 31, a connecting plate 32, a positioning pin 33 and a first connecting bolt 34. Figure 6 As shown, the tray body 31 is a plate-like structure (the first guide hole is provided on the tray body 31), and the upper surface of the tray body 31 serves as a product bearing surface, which plays a role in bearing the product. The tray body 31 is provided with a plurality of first mounting holes 31a at intervals along the second horizontal direction, the connecting plate 32 is connected to the first mounting hole 31a by the first connecting bolt 34, the positioning pin 33 is vertically provided on the upper surface of the connecting plate 32, and a prefabricated hole is provided on the product to be tested, and the positioning pin 33 is inserted upward into the prefabricated hole, thereby playing a role in positioning the product. In a preferred solution, a waist-shaped hole 32a is provided on the connecting plate 32, the first connecting bolt 34 passes through the waist-shaped hole 32a and is threadedly connected to the first mounting hole 31a, and the waist-shaped hole 32a is designed so that the connecting plate 32 and the positioning pin 33 can change positions, and can adapt to the positions of different prefabricated holes on the product.

[0041] The flap 4 is a plate-like structure, and the flap 4 is hinged to the lower needle plate 2. Figure 7 As shown, the specific hinged manner is that a side block 44 is hinged at the edge of the flap 4, the lower surface of the side block 44 is fixedly connected to the upper surface of the lower needle plate 2, and the flap 4 is hinged to the lower needle plate 2 through the side block 44, wherein, when the flap 4 is rotated to the top of the lower needle plate 2, the flap 4 and the lower needle plate 2 are in a parallel state.

[0042] The lower surface of the flip cover 4 is provided with a plurality of limit posts 41, such as Figure 3 and Figure 7 As shown, when the flip cover 4 rotates to the top of the lower needle plate 2, the lower surface of the limiting column 41 abuts against the upper surface of the lower needle plate 2, wherein the function of the limiting column 41 is to keep the flip cover 4 and the lower needle plate 2 parallel and maintain a certain spacing distance between the two.

[0043] The upper needle plate 5 is stacked on the upper cover 4, and the connection relationship between the upper needle plate 5 and the flip cover 4 is as follows: Figure 8 As shown, the flip cover 4 is provided with a plurality of second connecting members 42 (such as existing semi-threaded bolts, etc.), the second connecting members 42 extend vertically upward, and the upper needle plate 5 is provided with a plurality of second guide holes (not shown) corresponding to the second connecting members 42 one by one, and the second guide holes are coaxially sleeved on the outer periphery of the second connecting member 42, so that the upper needle plate 5 can slide axially relative to the flip cover 4 in the second connecting member 42 (in the working state, the axial direction of the second connecting member 42 is the height direction). A second elastic member 43 (such as a spring, etc.) is provided between the flip cover 4 and the upper needle plate 5, and the second elastic member 43 is coaxially sleeved on the outer periphery of the second connecting member 42, and the telescopic direction of the second elastic member 43 is configured as the axial direction of the second connecting member 42. The second elastic member 43 is provided so that the upper needle plate 5 and the upper needle group 8 are pushed away from the product when not in operation, that is, when no test is performed, there is a certain spacing distance between the upper needle plate 5 and the product, which can prevent the upper needle group 8 from scratching the product. At the same time, when the flip cover 4 is rotated to just above the lower needle plate 2, the upper needle plate 5 can be pressed down, so that the probe of the upper needle group 8 can be extended and retracted after contacting the product, thereby realizing the detection of the extension and retraction stroke of the probe, and facilitating the adaptation and adjustment of the upper needle group 8 to a suitable position (that is, the position of the upper needle group 8 can be adjusted by the needle group adjustment mechanism 6).

[0044] In a preferred embodiment, the test fixture further includes two buckle mechanisms 9 arranged on the test fixture along the second horizontal direction. After the upper needle plate 5 is pressed down to a certain position, the buckle mechanism 9 can lock the upper needle plate 5 and the lower needle plate 2 together. Specifically: Figure 4As shown, the buckle mechanism 9 includes a buckle tongue 91 and a base 92. The buckle tongue 91 is arranged on the upper needle plate 5, and the base 92 is arranged on the lower needle plate 2. A locking groove matching the buckle tongue 91 is arranged on the base 92. When the buckle tongue 91 is pressed down into the locking groove, the buckle mechanism 9 is in a locked state. The buckle tongue 91 can be made of elastic material, so the buckle tongue 91 can be deformed to remove the buckle tongue 91 from the locking groove. At this time, the buckle mechanism 9 is in an unlocked state. The specific structural form of the buckle mechanism 9 can also refer to the prior art.

[0045] like Figure 4 As shown, the lower needle plate 2 and the upper needle plate 5 are both provided with needle groups for testing products, and the needle groups are arranged on the upper needle plate 5 and the lower needle plate 2 through a needle group adjusting mechanism 6. Specifically, the lower needle group 7 is arranged on the lower needle plate 2 through the needle group adjusting mechanism 6, and the upper needle group 8 is arranged on the upper needle plate 5 through the needle group adjusting mechanism 6. The structural forms of the needle group adjusting mechanisms 6 on the upper needle plate 5 and the lower needle plate 2 are consistent.

[0046] like Figure 4 As shown, the lower needle plate 2 is provided with a sliding hole (labeled as P), and the sliding hole P passes through the lower needle plate 2 from top to bottom. Similarly, the upper needle plate 5 is also provided with a sliding hole P, and the sliding hole P passes through the upper needle plate 5 from top to bottom. The sliding hole P is used to install the needle group adjustment mechanism 6.

[0047] like Figure 4 As shown, the length direction of the sliding holes P of the upper needle plate 5 and the lower needle plate 2 are both configured as the first horizontal direction, which can facilitate the needle group adjustment mechanism 6 to drive the needle group to adjust the position along the first horizontal direction.

[0048] Among them, Figure 4 As shown, along the second horizontal direction, both ends of each needle group are connected with the needle group adjustment mechanism 6, and the number of the needle group adjustment mechanisms 6 corresponds to the number of the sliding holes P one by one.

[0049] The connection relationship between the needle plate 2 and the needle group adjustment mechanism 6 is described as an example. Figures 9 to 11 As shown:

[0050] like Fig. 9 and Fig.10 As shown, the needle group adjustment mechanism 6 includes a bolt and nut combination 61, a T-shaped block 62, a slider 63 and an adjustment bolt 64; the bolt and nut combination 61 (specifically, the bolt of the bolt and nut combination) passes through the sliding hole P on the lower needle plate 2 and the connecting hole on the T-shaped block 62 along the height direction, and then the T-shaped block 62 and the lower needle plate 2 are pressed together by the nut of the bolt and nut combination 61. At this time, the T-shaped block 62 is fixed together with the lower needle plate 2. When it is necessary to adjust the position of the T-shaped block 62 on the lower needle plate 2, it is only necessary to loosen the bolt and nut combination 61, and then the T-shaped block 62 can slide to the position in the first horizontal direction. After the position adjustment is completed, it can be locked again by the bolt and nut combination 61;

[0051] The slider 63 is slidably matched with the T-shaped block 62, and the slider 63 can slide in the T-shaped block 62 along the height direction. The lower needle group 7 is connected to the slider 63. When the slider 63 adjusts its position in the height direction, the lower needle group 7 can follow the slider 63 to adjust its position; in the preferred embodiment, a first guide groove 6a is provided in the middle position of the T-shaped block 62, and the length direction of the first guide groove 6a is configured as the height direction. The slider 63 is provided in the first guide groove 6a and can slide in the height direction, and the outer wall of the slider 63 is in contact with the inner wall of the first guide groove 6a, and the slider 63 is limited to slide only in the height direction by the first guide groove 6a.

[0052] As can be seen from the above, the slider 63 can follow the T-shaped block 62 to adjust its position in the first horizontal direction, and the slider 63 can adjust its position in the height direction relative to the T-shaped block 62 .

[0053] The adjusting bolt 64 is rotatably inserted into the T-shaped block 62 , and the axial direction of the adjusting bolt 64 is configured as the height direction. The adjusting bolt 64 is threadedly connected to the slider 63 , and the height position of the slider 63 can be adjusted by rotating the adjusting bolt 64 .

[0054] In a preferred embodiment, Fig.10 As shown, a second guide groove 6c is provided on the T-shaped block 62, and the length direction of the second guide groove 6c is configured as the height direction. The lower needle group 7 is provided with a third mounting hole, and a guide member 65 (such as a bolt, etc.) extending along the second horizontal direction is provided in the third mounting hole. One end of the guide member 65 extends into the second guide groove 6c along the second horizontal direction. The cooperation between the second guide groove 6c and the guide member 65 limits the lower needle group 7 to move only in the height direction relative to the T-shaped block 62.

[0055] In a preferred embodiment, Fig.11 As shown, a plurality of second mounting holes 6b are provided at the end of the lower needle group 7, and the plurality of second mounting holes 6b are arranged at intervals in the height direction, and the slider 63 is connected to the second mounting hole 6b by a second connecting bolt (not shown). In the embodiment of the present application, a plurality of second mounting holes 6b are provided so that the slider 63 can select the installation position according to the actual situation, so as to cope with the situation that the height position of the lower needle group 7 needs to be adjusted in a wide range.

[0056] Similarly, the connection relationship between the upper needle plate 5 and the needle group adjusting mechanism 6 can refer to the connection relationship between the lower needle plate 2 and the needle group adjusting mechanism 6, which will not be repeated here.

[0057] A working method of the test fixture of the embodiment of the present application is as follows:

[0058] 1. Rotate the flap 4 and the upper needle plate 5 upward to open them, and then place the product to be tested on the upper surface of the tray 3, with the positioning pins 33 of the tray 3 inserted upward into the prefabricated holes of the product;

[0059] 2. Press the product and the tray 3 downward so that the product applies downward pressure to the probe of the lower needle group 7, and then adjust the position of the lower needle group 7 according to actual needs, specifically, adjust the position of the lower needle group 7 through the needle group adjustment mechanism 6;

[0060] 3. Rotate the flip cover 4 and the upper needle plate 5 downward to cover the upper part of the lower needle plate 2, and then press the upper needle plate 5 downward until the upper needle plate 5 and the lower needle plate 2 are locked together by the buckle mechanism 9, and then adjust the position of the upper needle group 8 according to actual needs, specifically, adjust the position of the upper needle group 8 by the needle group adjustment mechanism 6;

[0061] 4. The product contacts the probes of the upper needle group 8 and the lower needle group 7, and then the test work is started. After the test work is completed, the buckle mechanism 9 is unlocked, the flip cover 4 and the upper needle plate 5 are rotated upward to open, and finally the product is taken out, and the test work is completed.

[0062] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A test fixture, characterized in that: It comprises a bottom box (1), a lower needle plate (2), a tray (3), a flip cover (4), an upper needle plate (5) and a plurality of needle group adjustment mechanisms (6); The bottom box (1) is arranged on a working surface; The lower needle plate (2) is arranged on the bottom box (1); The tray (3) is arranged on the lower needle plate (2) and is used to mount the product to be tested; The flip cover (4) is hinged to the lower needle plate (2) and can be rotated to cover the upper part of the lower needle plate (2); The upper needle plate (5) is stacked above the flip cover (4); The upper needle plate (5) and the lower needle plate (2) are both provided with a sliding hole (P) along a first horizontal direction, and the upper needle plate (5) and the lower needle plate (2) are both provided with the needle group adjustment mechanism (6); The needle group adjustment mechanism (6) comprises a bolt and nut combination (61), a T-shaped block (62), a slider (63) and an adjustment bolt (64); the bolt and nut combination (61) passes through the slide hole (P), and the bolt and nut combination (61) is connected to the T-shaped block (62), and the bolt and nut combination (61) is used to fix the T-shaped block (62) and the upper needle plate (5) or the lower needle plate (2) together; the slider (63) is slidably arranged on the T-shaped block (62) along the height direction; the adjustment bolt (64) is rotatably arranged on the T-shaped block (62), and the adjustment bolt (64) is threadedly connected to the slider (63); the lower needle group (7) and the upper needle group (8) used for testing the product are respectively connected to the sliders (63) of the plurality of needle group adjustment mechanisms (6).

2. The test fixture according to claim 1, characterized in that: The lower needle plate (2) is provided with a first connecting piece (21), and the tray (3) is provided with a first guide hole slidably mounted on the first connecting piece (21), so that the tray (3) can slide relative to the lower needle plate (2) in a height direction; a first elastic piece (22) is provided between the tray (3) and the lower needle plate (2).

3. The test fixture according to claim 2, characterized in that: The tray (3) comprises a tray body (31), a connecting plate (32) and a positioning pin (33); the tray body (31) is provided with a plurality of first mounting holes (31a) spaced apart along a second horizontal direction; the connecting plate (32) and the first mounting holes (31a) are connected via first connecting bolts (34); and the positioning pin (33) is inserted and matched with a prefabricated hole on a product.

4. The test fixture according to claim 3, characterized in that: The connecting plate (32) is provided with a waist-shaped hole (32a), and a first connecting bolt (34) passes through the waist-shaped hole (32a) and is threadedly connected to the first mounting hole (31a).

5. The test fixture according to claim 1, characterized in that: A limiting column (41) is arranged on one side of the flip cover (4) facing the lower needle plate (2); when the limiting column (41) abuts against the lower needle plate (2), the flip cover (4) is in a horizontal state.

6. The test fixture according to any one of claims 2 to 5, characterized in that: The flip cover (4) is provided with a second connecting piece (42), and the upper needle plate (5) is provided with a second guide hole slidably sleeved on the second connecting piece (42), so that the upper needle plate (5) can slide in the height direction relative to the flip cover (4); a second elastic piece (43) is provided between the upper needle plate (5) and the flip cover (4).

7. The test fixture according to claim 6, characterized in that: The upper needle plate (5) and the lower needle plate (2) are locked by a buckle mechanism (9).

8. The test fixture according to claim 1, characterized in that: The T-shaped block (62) is provided with a first guide groove (6a), and the length direction of the first guide groove (6a) is configured as the height direction; the sliding block (63) is slidably arranged in the first guide groove (6a), and the side wall of the sliding block (63) is in contact with the inner side wall of the first guide groove (6a).

9. The test fixture according to claim 8, characterized in that: The upper needle group (8) and the lower needle group (7) are both provided with a plurality of second mounting holes (6b) along the height direction, and the sliding block (63) is connected to the second mounting hole (6b) via a second connecting bolt.

10. The test fixture according to claim 8 or 9, characterized in that: The T-shaped block (62) is provided with a second guide groove (6c), the length direction of the second guide groove (6c) is configured as the height direction, the upper needle group (8) and the lower needle group (7) are both provided with a third mounting hole, a guide member (65) extending along a second horizontal direction is provided in the third mounting hole, and at least a portion of the guide member (65) is provided in the second guide groove (6c).

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