Downward pressing mechanism of test fixture and earphone test tool

Abstract

The utility model discloses a press-down mechanism of a test fixture and an earphone test tool. The press-down mechanism of the test fixture comprises a base, a cover plate, a guide assembly and a second connecting assembly. The cover plate can cover the base and comprises a base cover part, a floating cover, a pressure head part, a first elastic piece and a second elastic piece, the first elastic piece is arranged between the pressure head part and the floating cover, and the pressure head part can float in the first direction relative to the floating cover; a second elastic piece is arranged between the floating cover and the base cover part, and the floating cover can float in the first direction relative to the base cover part; the guide assembly comprises a guide column and a guide hole which can be matched in an inserted mode. The floating cover is detachably connected with the base cover part through a second connecting assembly; by setting the floating of the pressing head part and the floating of the floating cover, the downward pressing process of the pressing head part is divided into the movement of the floating cover and the movement of the pressing head part, errors in the horizontal direction are corrected, and the jig positioning precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of test fixture technology, and in particular to a pressing mechanism for a test fixture and an earphone testing tool. Background Technology

[0002] In related technologies, for the contact between the pressure head and the product under test in the test fixture, a movable pressure head combined with an elastic buffer is usually used to ensure that the pressure head can adaptively contact the product under test. Although it can adaptively contact the product under test within a small range, it always suffers from low contact accuracy. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pressing mechanism for a test fixture and an earphone testing fixture. By floating the pressing head and the floating cover, the horizontal error of the pressing head is compensated, ensuring the alignment of the guide post and the guide hole, and improving the positioning accuracy of the tested product.

[0004] On one hand, this utility model embodiment provides a pressing mechanism for a test fixture, comprising:

[0005] The base is suitable for placing the product being tested.

[0006] A cover plate, which is flipped and connected to one side of the base, is capable of covering the base. The cover plate includes a base cover, a floating cover, a pressing head, a first elastic member, and a second elastic member. The pressing head is capable of floating relative to the floating cover in a first direction, and the first elastic member is disposed between the pressing head and the floating cover. The floating cover is capable of floating relative to the base cover in the first direction, and the second elastic member is disposed between the floating cover and the base cover.

[0007] A guide assembly includes a guide post and a guide hole that can be plugged into each other, wherein one of the guide post and the guide hole is located in the pressure head and the other is located in the base;

[0008] The second connecting component allows the floating cover and the base cover to be detachably connected.

[0009] According to some embodiments of the present invention, the pressing mechanism of the test fixture further includes a first anti-mistake hook and a second anti-mistake hook that can be separated and joined. The first anti-mistake hook is slidably connected to the base cover, and the second anti-mistake hook is connected to the base. The first anti-mistake hook is linked to the floating cover and is suitable for switching between a first position and a second position.

[0010] The first position is the position where the first anti-mistake hook and the second anti-mistake hook are separated when the floating cover is fixed; the second position is the position where the first anti-mistake hook and the second anti-mistake hook are engaged when the floating cover is fixed.

[0011] According to some embodiments of the present invention, the pressing mechanism of the test fixture further includes a third elastic element, and the third elastic element is provided on the side of the first anti-fooling hook opposite to the floating cover, and the third elastic element abuts against the first anti-fooling hook and the base cover.

[0012] According to some embodiments of the present invention, the first anti-foolproof hook is provided with a first wedge-shaped surface, the floating cover is provided with a second wedge-shaped surface, the first wedge-shaped surface and the second wedge-shaped surface cooperate and abut against each other, and the first wedge-shaped surface and the second wedge-shaped surface are simultaneously set at an angle to the first direction and the moving direction of the first anti-foolproof hook.

[0013] According to some embodiments of this utility model, when the cover plate is closed on the base, the distance between the end of the guide post near the base and the opening of the guide hole is in the range of 1 mm to 2 mm.

[0014] According to some embodiments of the present invention, the pressure head is provided with an inclined pressing surface, which is adapted to and parallel to the inner cavity opening contour of the product being tested.

[0015] According to some embodiments of this utility model, the pressure head is provided with a power supply contact, which is adapted to be electrically connected to the product under test.

[0016] According to some embodiments of the present invention, the base includes a base and a product placement seat, wherein the product placement seat is detachably connected to the base.

[0017] According to some embodiments of the present invention, the product placement seat includes a first placement seat and a second placement seat. The first placement seat is provided with a first placement groove, and the second placement seat is provided with a second placement groove. The first placement groove and the second placement groove are used to place different parts of the product under test.

[0018] On the other hand, this utility model embodiment also provides an earphone testing fixture, including the pressing mechanism of the testing fixture as described above;

[0019] An artificial ear, wherein the artificial ear is connected to the base, and the receiving end of the artificial ear faces the sound-emitting end of the product under test on the base.

[0020] This utility model embodiment has at least the following beneficial effects: By setting the floating of the pressure head and the floating of the floating cover, the pressing process of the pressure head is decomposed into the movement of the floating cover and the movement of the pressure head. This allows the positional offset when the base cover is placed on the base to be compensated by the second elastic element, while the positional offset between the pressure head and the product under test can be compensated by the first elastic element. This allows the operator to correct the horizontal alignment error within a certain range when placing the cover on the base, ensuring that the guide post and guide hole correspond, and effectively reducing the operational difficulty of the test fixture. Furthermore, based on the guiding effect of the guide post and guide hole, it ensures that the pressure head accurately presses against the product under test.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is one of the structural schematic diagrams of the headphone testing fixture according to an embodiment of this utility model;

[0024] Figure 2 This is a top view of the headphone testing fixture according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 A sectional view along section line AA;

[0026] Figure 4 for Figure 3 A sectional view along section line BB;

[0027] Figure 5 This is a second schematic diagram of the headphone testing fixture according to an embodiment of the present utility model;

[0028] Figure 6 This is an exploded view of the headphone testing fixture according to an embodiment of the present invention.

[0029] Figure label:

[0030] 100. Base; 110. Base; 120. Product placement seat; 121. First placement seat; 122. Second placement seat;

[0031] 200, cover plate; 210, base cover; 220, floating cover; 230, pressing head; 231, pressing surface; 232, power supply contact; 240, first elastic element; 250, second elastic element;

[0032] 310. Guide post; 320. Guide hole;

[0033] 410. First connecting component; 420. Second connecting component;

[0034] 511. First anti-mistake hook; 512. Third elastic element; 521. Second anti-mistake hook;

[0035] 600. Artificial ear. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, the terms "setting", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0040] Please refer to Figures 1 to 3 and Figure 6As shown, in one aspect, this utility model embodiment provides a pressing mechanism for a test fixture, including a base 100, a cover plate 200, a guide assembly, and a second connecting assembly 420. The base 100 is suitable for placing the product to be tested; the cover plate 200 is flipped and connected to one side of the base 100, and can cover the base 100. The cover plate 200 includes a base cover portion 210, a floating cover 220, a pressing head 230, a first elastic member 240, and a second elastic member 250. The pressing head 230 can float relative to the floating cover 220 in a first direction, and the first elastic member 240... 40 is disposed between the pressure head 230 and the floating cover 220; the floating cover 220 is able to float relative to the base cover 210 in a first direction, and the second elastic member 250 is disposed between the floating cover 220 and the base cover 210; the guide assembly includes a guide post 310 and a guide hole 320 that can be inserted and fitted, one of the guide post 310 and the guide hole 320 is disposed in the pressure head 230, and the other is disposed in the base 100; the second connecting assembly 420 is used to detachably connect the floating cover 220 and the base cover 210.

[0041] According to the pressing mechanism of the test fixture in this embodiment of the utility model, the product under test is placed in the base 100 for positioning, and the cover plate 200 is closed on the base 100. At this time, the base cover 210 and the base 100 are relatively fixed in position, and the floating cover 220 and the pressing head 230 float relative to the base 100, so that the guide post 310 on the pressing head 230 and the guide hole 320 on the base 100 can be inserted and engaged. Under the guidance of the guide component, the pressing head 230 presses down until it presses against the product under test. At this time, the floating cover 220 continues to move along the Z direction shown in the figure, while the pressing head 230 can no longer move. The first elastic member 240 and the second elastic member 250 are compressed until the floating cover 220 and the base cover 210 are relatively fixed through the second connecting component 420, thereby realizing the limiting and fixing of the product under test. After the product under test is tested, the staff releases the fixation of the second connecting component 420. Under the elastic force of the first elastic member 240 and the second elastic member 250, the floating cover 220 and the pressing head 230 are reset.

[0042] It should be noted that in related technologies, the contact between the pressure head and the product under test in the test fixture is usually achieved by using a movable pressure head in conjunction with an elastic buffer to ensure that the pressure head can adaptively contact the surface of the product under test and improve the pressure effect. However, this solution has high requirements for the initial position of the pressure head in actual use (the pressure head needs to be as parallel as possible to the contact surface of the product under test when the cover plate 200 is closed). If the initial position accuracy is not high (such as when tilted at a certain angle), the local deformation of the multiple elastic buffers connected to the pressure head will be insufficient, which will prevent the pressure head from making full contact with the product under test.

[0043] According to the pressing mechanism of the test fixture in this embodiment of the present invention, firstly, by setting the floating of the pressing head 230 and the floating of the floating cover 220, the pressing process of the pressing head 230 is decomposed into the movement of the floating cover 220 and the movement of the pressing head 230. This allows the positional offset of the base cover 210 when it is placed on the base 100 to be compensated by the second elastic element 250, while the positional offset between the pressing head 230 and the product under test can be compensated by the first elastic element 240. This allows the operator to correct the horizontal alignment error within a certain range when placing the cover plate 200 on the base 100, ensuring that the guide post 310 and the guide hole 320 correspond, effectively reducing the operational difficulty of the test fixture. Furthermore, based on the guiding effect of the guide post 310 and the guide hole 320, it ensures that the pressing head 230 accurately presses against the product under test.

[0044] In this embodiment, the first elastic element 240 and the second elastic element 250 can be linear springs. In other embodiments, elastic components such as torsion springs and silicone pads can also be used.

[0045] In this embodiment, to ensure the stability of the movement of the floating cover 220 and the pressing head 230, a second elastic element 250 is provided at each end of the floating cover 220, and a first elastic element 240 is provided at each end of the pressing head 230. The floating cover 220 and the pressing head 230, as well as the floating cover 220 and the base cover 210, are connected by a limiting pin. The outer side of the limiting pin is suitable for sleeved with the first elastic element 240 or the second elastic element 250. Of course, in other embodiments, the two ends of the first elastic element 240 can be directly connected to the pressing head 230 and the floating cover 220, and the two ends of the second elastic element 250 can be directly connected to the floating cover 220 and the base cover 210.

[0046] In this embodiment, the second connecting component 420 can be a snap-fit; in other embodiments, it can also be a magnetic connection, a quick-release pin, or the like.

[0047] In this embodiment, "floating between two components" usually refers to the existence of controllable relative degrees of freedom of movement between the two. This design allows the components to move in a specific direction or range to compensate for errors.

[0048] In this embodiment, the cover plate 200 can be flipped and connected to the base 100 in the form of a hinge, etc. The flipped connection ensures that the cover plate 200 can be accurately positioned with the base 100 each time. Compared with the quick clamp structure used on conventional fixtures, it is smaller in size and more conducive to use in confined environments. It is especially suitable for the field of headphone testing, where headphone testing fixtures need to be placed in a sound shielding box for testing. The space inside the sound shielding box is small and not conducive to the layout of pneumatic pipelines. The physical structure of the flipped connection effectively solves the above problems.

[0049] In this embodiment, the pressing mechanism of the test fixture further includes a first connecting component 410, through which the base cover 210 and the base 100 are detachably connected. The first connecting component 410 fixes the flipped base cover 210 to the base 100, eliminating the need for continuous pressure on the base cover 210 during product testing. This is particularly suitable for fixtures requiring placement in an independent environment (such as headphone testing fixtures placed in a sound-shielding box). The first connecting component 410 has a similar structure to the second connecting component 420 described earlier.

[0050] In this embodiment, combined with Figure 2 As shown, when the pressing mechanism of the test fixture in this embodiment of the present invention is used for headphone testing, the left and right headphones are tested simultaneously. Therefore, the two sides along the dotted line in the figure are mirror symmetrical structures. It can be understood that when there is only one product under test, the number of internal parts of the pressing mechanism can be adjusted accordingly.

[0051] In this embodiment, a buffer layer (not shown in the figure) is provided on the side of the pressure head 230 facing the product being tested. The buffer layer can be a cotton cloth layer, a silicone layer, etc., to buffer the hard contact between the pressure head 230 and the product being tested.

[0052] In some embodiments, combined with Figure 2 , Figures 4 to 6 As shown, the pressing mechanism of the test fixture also includes a first anti-mistake hook 511 and a second anti-mistake hook 521 that can be separated and engaged. The first anti-mistake hook 511 is slidably connected to the base cover 210, and the second anti-mistake hook 521 is connected to the base 100. The first anti-mistake hook 511 is linked to the floating cover 220 and is suitable for switching between a first position and a second position. The first position is the position where the first anti-mistake hook 511 and the second anti-mistake hook 521 are separated when the floating cover 220 is fixed. The second position is the position where the first anti-mistake hook 511 and the second anti-mistake hook 521 are engaged when the floating cover 220 is fixed.

[0053] In this embodiment, when fixing the product under test, the base cover 210 is first placed on top of the base 100. The operator pushes the floating cover 220 along the Z direction as shown in the figure, so that the pressure head 230 presses against the product under test. During the movement of the floating cover 220, the floating cover 220 moves along the Z direction and pushes the first anti-mistake hook 511 from the first position to the second position along the Y direction. The first anti-mistake hook 511 and the second anti-mistake hook 521 cooperate to fix it. However, when the operator moves the floating cover 220 directly without placing the base cover 210 on the base 100, the first anti-mistake hook 511, which is pushed by the floating cover 220, will switch to the second position and interfere with the second anti-mistake hook 521 when the base cover 210 is placed on the base 100, resulting in the inability to close the cover.

[0054] After the product under test is completed, if the second connecting component 420 is not unlocked, the floating cover 220 cannot move, causing the first anti-foolproof hook 511 to remain in the second position and engage with the second anti-foolproof hook 521. The staff cannot flip the base cover 210 off the base 100. Only after the second connecting component 420 is unlocked, the floating cover 220 moves and drives the first anti-foolproof hook 511 from the second position to the first position, and the engagement with the second anti-foolproof hook 521 is released, can the base cover 210 be flipped.

[0055] In this embodiment, by linking the movement of the first anti-foolproof hook 511 with the floating cover 220, the position of the first anti-foolproof hook 511 depends on the position of the floating cover 220, thus ensuring that the usage process of the test fixture always follows this procedure: the base cover 210 is closed onto the base 100, and then the floating cover 220 is pressed down so that the pressure head 230 fully presses against the product under test, ensuring that the product is securely fixed. After the test is completed, the pressed floating cover 220 must be released first so that the pressure head 230 is detached from the product before the fixed connection between the base cover 210 and the base 100 can be released. This avoids unstable fixing of the product under test due to incorrect operation sequence. In particular, when the pressure head 230 is provided with a power supply contact 232 (the power supply contact 232 will be described in detail in the following embodiment), it can effectively prevent the power supply contact 232 from impacting the product under test and causing damage.

[0056] In some embodiments, combined with Figure 1 , Figures 2 to 6 As shown, the pressing mechanism of the test fixture also includes a third elastic element 512. The third elastic element 512 is provided on the side of the first anti-fooling hook 511 opposite to the floating cover 220. The third elastic element 512 abuts against the first anti-fooling hook 511 and the base cover 210.

[0057] In this embodiment, while the floating cover 220 moves along the Z direction, it pushes the first anti-foolproof hook 511 along the Y direction to switch from the first position to the second position. While the first anti-foolproof hook 511 moves, it presses against the third elastic member 512 to compress it. After the product under test is tested, the staff unlocks the second connecting component 420, and the floating cover 220 moves upward along the Z direction. Under the elastic force of the third elastic member 512, the first anti-foolproof hook 511 switches from the second position to the first position, releasing its engagement with the second anti-foolproof hook 521.

[0058] In this embodiment, the first anti-foolproof hook 511 is automatically reset by the elastic force of the third elastic element 512, which is simple and reliable.

[0059] In this embodiment, the structure of the third elastic element 512 is similar to that of the first elastic element 240 described above.

[0060] In other embodiments, the linkage connection between the floating cover 220 and the first anti-foolproof hook 511 can also be achieved through a universal joint, a sliding groove, or a sliding table.

[0061] In some embodiments, combined with Figure 2 , Figures 4 to 6 As shown, the first anti-foolproof hook 511 is provided with a first wedge-shaped surface, and the floating cover 220 is provided with a second wedge-shaped surface. The first wedge-shaped surface and the second wedge-shaped surface cooperate and abut against each other, and are set at an angle to the first direction and the moving direction of the first anti-foolproof hook 511.

[0062] In this embodiment, the first wedge surface and the second wedge surface are inclined surfaces. The movement of the floating cover 220 along the Z direction is converted into the movement of the first anti-fool hook 511 along the Y direction through the first wedge surface and the second wedge surface. In other embodiments, the first wedge surface and the second wedge surface can be the same arc surface, folded surface, etc. Of course, they can also be different, such as one being an arc surface and the other being an inclined surface, as long as there is a contact point for movement between the two.

[0063] In some embodiments, combined with Figure 6 As shown, when the cover plate 200 is closed on the base 100, the distance between the end of the guide post 310 near the base 100 and the opening of the guide hole 320 is between 1 mm and 2 mm.

[0064] In this embodiment, a gap is maintained between the guide post 310 and the opening of the guide hole 320 when the cover is closed, to prevent the guide post 310 from directly colliding with the base 100 and causing damage, and to reserve space for the movement compensation of the pressure head 230 and the floating cover 220, so as to ensure the stable insertion of the guide post 310 and the guide hole 320.

[0065] In some embodiments, combined with Figure 2 and Figure 3 As shown, the pressure head 230 is provided with an inclined pressing surface 231, which is adapted to and parallel to the inner cavity opening contour of the product being tested.

[0066] In this embodiment, the pressure surface 231 is adapted to the inner cavity opening contour of the product under test (such as the opening of the front cavity of an earphone). After the cover plate 200 is fitted onto the base 100 around the rotation axis, the pressure surface 231 is inclined at a certain angle to the horizontal plane, so that the pressure surface 231 is parallel to the plane containing the inner cavity opening contour of the product under test. During the process of the floating cover 220 driving the pressure head 230 to press down, the pressure surface 231 always remains parallel to the inner cavity opening and finally fits tightly, thereby sealing the inner cavity of the product under test. Thus, considering the special structural characteristics (inclined setting) of the inner cavity opening of the product under test, this embodiment decomposes the sealing process into the flipping of the base cover 210 and the pressing of the pressure head 230, ensuring that the pressure surface 231 is always parallel to the inner cavity opening during the sealing movement, thereby ensuring that each position of the pressure surface 231 fits tightly with the inner cavity opening to achieve a good sealing effect.

[0067] In some embodiments, combined with Figure 6 As shown, the pressure head 230 is provided with a power supply contact 232, which is suitable for electrical connection with the product under test. The test fixture can supply power to the internal circuit of the product under test through the power supply contact 232 to test some functions. For example, when the test fixture is used for headphone testing, it can be connected to the headphone's sound circuit to activate the sound circuit to produce sound.

[0068] In some embodiments, combined with Figure 1 As shown, the base 100 includes a base 110 and a product placement seat 120, with the product placement seat 120 detachably connected to the base 110. By replacing different product placement seats 120 for different product specifications, the adaptability of the test fixture to different products is effectively improved.

[0069] In some embodiments, combined with Figure 1 and Figure 6 As shown, the product placement seat 120 includes a first placement seat 121 and a second placement seat 122. The first placement seat 121 is provided with a first placement groove (not shown in the figure), and the second placement seat 122 is provided with a second placement groove (not shown in the figure). The first placement groove and the second placement groove are used to place different parts of the product being tested.

[0070] It is understood that products under test with internal circuitry typically have detachable front and rear shells for easy assembly. In this embodiment, the front shell is placed in the first placement slot and the rear shell is placed in the second placement slot. By positioning the front and rear shells, the position of the internal circuitry connected between the front and rear shells is always consistent, which ensures that the power supply contact 232 supplies power to the internal circuitry.

[0071] On the other hand, combining Figure 1 and Figure 6As shown, this embodiment of the invention also provides an earphone testing fixture, including a pressing mechanism of the testing fixture as described in the above embodiment and an artificial ear 600. The artificial ear 600 is connected to the base 100, and the receiving end of the artificial ear 600 faces the sound-emitting end of the product under test on the base 100. The artificial ear 600 is a sound-receiving device used to simulate the human ear.

[0072] In this embodiment, the earphone is placed in the base 100. While the head 230 presses against and fixes the earphone, the sound-emitting end of the earphone is activated to emit sound. The receiving end of the artificial ear 600 fixed to the base 100 detects the sound from the earphone and converts it into characteristic parameters for evaluating whether the earphone is qualified.

[0073] In other embodiments, the power supply contact 232 mentioned above can be used to supply power to the sound-producing circuit inside the headphones to activate the headphones to produce sound.

[0074] In this embodiment, the wall of the first placement slot is provided with a sealing layer. This reduces sound leakage, thereby reducing sound transmission loss between the sound-generating end of the earphone and the sound-receiving end of the artificial ear 600.

[0075] In this embodiment, the sealing layer can be a silicone pad, sound insulation cotton, etc.

[0076] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A pressing mechanism for a test fixture, characterized in that, include: Base (100) is suitable for placing the product being tested; A cover plate (200) is flipped and connected to one side of the base (100) and can cover the base (100). The cover plate (200) includes a base cover portion (210), a floating cover (220), a pressing head (230), a first elastic member (240), and a second elastic member (250). The pressing head (230) can float relative to the floating cover (220) in a first direction, and the first elastic member (240) is disposed between the pressing head (230) and the floating cover (220). The floating cover (220) can float relative to the base cover portion (210) in the first direction, and the second elastic member (250) is disposed between the floating cover (220) and the base cover portion (210). The guide assembly includes a guide post (310) and a guide hole (320) that can be plugged into each other, wherein one of the guide post (310) and the guide hole (320) is located in the pressure head (230) and the other is located in the base (100). The second connecting assembly (420) is used to detachably connect the floating cover (220) and the base cover (210).

2. The pressing mechanism of the test fixture according to claim 1, characterized in that, The pressing mechanism of the test fixture also includes a first anti-mistake hook (511) and a second anti-mistake hook (521) that can be separated and joined. The first anti-mistake hook (511) is slidably connected to the base cover (210), and the second anti-mistake hook (521) is connected to the base (100). The first anti-mistake hook (511) is linked to the floating cover (220) and is suitable for switching between a first position and a second position. The first position is the position where the first anti-foolproof hook (511) and the second anti-foolproof hook (521) are separated when the floating cover (220) is fixed; the second position is the position where the first anti-foolproof hook (511) and the second anti-foolproof hook (521) are engaged when the floating cover (220) is fixed.

3. The pressing mechanism of the test fixture according to claim 2, characterized in that, The pressing mechanism of the test fixture also includes a third elastic element (512). The third elastic element (512) is provided on the side of the first anti-fool hook (511) opposite to the floating cover (220). The third elastic element (512) abuts against the first anti-fool hook (511) and the base cover (210).

4. The pressing mechanism of the test fixture according to claim 3, characterized in that, The first anti-foolproof hook (511) is provided with a first wedge-shaped surface, and the floating cover (220) is provided with a second wedge-shaped surface. The first wedge-shaped surface and the second wedge-shaped surface cooperate and abut against each other, and the first wedge-shaped surface and the second wedge-shaped surface are simultaneously set at an angle to the first direction and the moving direction of the first anti-foolproof hook (511).

5. The pressing mechanism of the test fixture according to any one of claims 1 to 4, characterized in that, When the cover plate (200) is closed on the base (100), the distance between the end of the guide post (310) near the base (100) and the opening of the guide hole (320) is between 1 mm and 2 mm.

6. The pressing mechanism of the test fixture according to claim 1, characterized in that, The pressure head (230) is provided with an inclined pressure surface (231), which is adapted to and parallel to the inner cavity opening profile of the product being tested.

7. The pressing mechanism of the test fixture according to any one of claims 1 to 4 or 6, characterized in that, The pressure head (230) is provided with a power supply contact (232), which is adapted to be electrically connected to the product under test.

8. The pressing mechanism of the test fixture according to any one of claims 1 to 4, characterized in that, The base (100) includes a base (110) and a product placement seat (120), the product placement seat (120) being detachably connected to the base (110).

9. The pressing mechanism of the test fixture according to claim 8, characterized in that, The product placement seat (120) includes a first placement seat (121) and a second placement seat (122). The first placement seat (121) is provided with a first placement slot, and the second placement seat (122) is provided with a second placement slot. The first placement slot and the second placement slot are used to place different parts of the product under test.

10. A headphone testing fixture, characterized in that, Includes the pressing mechanism of the test fixture as described in any one of claims 1 to 9; Artificial ear (600), the artificial ear (600) is connected to the base (100), and the receiving end of the artificial ear (600) faces the sound-emitting end of the product under test on the base (100).

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