An inspection fixture

Abstract

The present disclosure provides a detection jig, which comprises a digital display meter; a detection base comprising a bearing part and two leg parts connected to the bearing part, a detection space for detecting a to-be-detected member being formed between the two leg parts, the digital display meter being arranged in the bearing part and a measuring part of the digital display meter extending into the detection space; the leg part comprises a positioning surface in contact with the to-be-detected member, the digital display meter has a zero-return state and a measuring state, when the digital display meter is in the zero-return state, the measuring part is located at a first theoretical intersection point of the two positioning surfaces, when the digital display meter is in the measuring state, the measuring part is in abutment with a rounded corner vertex of the to-be-detected member. The detection jig of the present disclosure can effectively measure the rounded corner of the to-be-detected member, the user only needs to place the to-be-detected member in the detection space, make the to-be-detected member contact with the positioning surface, and then switch the digital display meter from the zero-return state to the measuring state, so as to obtain the measurement data, thereby greatly improving the detection efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of electronic device casing inspection technology, and in particular to an inspection fixture. Background Technology

[0002] R-angle, or rounded corner, is typically used to represent the rounded transition at the intersection of two straight lines. The radius of this rounded transition is the value of the R-angle. For example, R5 represents an arc with a radius of 5mm, and R10 represents an arc with a radius of 10mm. The fullness of the R-angle vertex refers to the perpendicular distance from the vertex of the R-angle to the intersection point of the extended sides of the R-angle. For example, in the manufacturing process of metal casings for electronic devices, the design of the outer circumference R-angle is crucial for user experience and the wear resistance of the product's edges and corners.

[0003] Currently, the commonly used testing method is to project and measure the R-squared width of the product. However, the actual size and fullness of the R-corner vertices cannot be controlled by routine measurements and cannot be accurately measured. This makes it difficult to accurately assess whether the R-corners of electronic device casings meet product design requirements, thus affecting product quality control. Utility Model Content

[0004] This disclosure provides a testing fixture to at least solve the above-mentioned technical problems existing in the prior art.

[0005] The testing fixture disclosed herein includes:

[0006] Digital display, including a measuring section; and

[0007] The testing base includes a support portion and two support legs connected to the support portion, with a testing space formed between the two support legs for testing the test piece, the digital display being mounted on the support portion and the measuring portion extending into the testing space;

[0008] The support leg includes a positioning surface that contacts the part under test. The digital display has a zeroing state and a measurement state. When the digital display is in the zeroing state, the measuring part is located at the first theoretical intersection of the extension lines of the two positioning surfaces. When the digital display is in the measurement state, the measuring part abuts against the rounded corner vertex of the part under test.

[0009] In one embodiment, the detection space includes a first space for accommodating the test piece and a second space for accommodating the rounded corner, the first space and the second space being connected, the second space being formed at the bottom of the support portion, and the first theoretical intersection point being located within the second space.

[0010] In one embodiment, the supporting part has a through hole, and the measuring part is disposed in the through hole.

[0011] In one embodiment, the axis of the through hole coincides with the angle bisector of the internal angle formed by the two positioning surfaces at the first theoretical intersection point.

[0012] In one embodiment, a fixing member is further included, disposed on the support portion, the fixing member being adapted to the support portion to jointly fix the digital display.

[0013] In one embodiment, a zeroing base is further included. The zeroing base is detachably connected to the detection base. The zeroing base is provided with two positioning reference surfaces that correspond one-to-one with the two positioning surfaces. The included angle formed by the extension lines of the two positioning reference surfaces is equal to the included angle formed by the extension lines of the two positioning surfaces.

[0014] In one embodiment, the zeroing base is provided with a zeroing part, which extends into the detection space to adjust the digital display to a zeroing state.

[0015] In one embodiment, the zeroing section has a zeroing surface, and the second theoretical intersection point of the extension lines of the two positioning reference surfaces is located on the zeroing surface.

[0016] In one embodiment, the measuring unit has a zero position within the detection space, and when the measuring unit is in the zero position, the measuring unit abuts against the zero surface.

[0017] In one embodiment, the digital display further includes a data processing module, which is configured to determine whether the fillet is qualified based on the measurement result obtained by the digital display in the measurement state.

[0018] In this disclosure, the inspection fixture, using a digital display and an inspection base in conjunction, effectively measures the fillet radius of the workpiece by setting a positioning surface and using the intersection of the extended lines of the positioning surface as the zeroing reference. The user simply places the workpiece in the inspection space, ensuring it contacts the positioning surface, and then switches the digital display from zeroing to measurement mode to obtain the measurement data, significantly improving inspection efficiency. Furthermore, the structure of the inspection fixture is not dependent on the shape and size of a specific product. By appropriately adjusting or replacing the inspection base according to different workpieces and fillet radius specifications, it can be applied to the fillet radius inspection of various products, demonstrating strong versatility.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0020] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0021] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0022] Figure 1 A schematic diagram of an overall structure of a testing fixture according to an exemplary embodiment of the present disclosure is shown;

[0023] Figure 2 A schematic diagram of the structure of a detection base of a detection fixture according to an exemplary embodiment of the present disclosure is shown;

[0024] Figure 3 A schematic diagram of another structure of the detection base of the detection fixture of the exemplary embodiment of this disclosure is shown;

[0025] Figure 4 A partial cross-sectional view of an exemplary embodiment of this disclosure is shown when a testing fixture measures a workpiece.

[0026] Figure 5 A cross-sectional schematic diagram of a test piece according to an exemplary embodiment of the present disclosure is shown;

[0027] Figure 6 A cross-sectional schematic diagram of another test piece of an exemplary embodiment of this disclosure is shown;

[0028] Figure 7 A schematic diagram of another overall structure of the testing fixture, an exemplary embodiment of the present disclosure, is shown;

[0029] Figure 8 A schematic diagram of the structure of the fixture of the detection jig, as shown in an exemplary embodiment of the present disclosure, is presented.

[0030] Figure 9 A schematic diagram of another overall structure of the testing fixture, an exemplary embodiment of the present disclosure, is shown;

[0031] Figure 10 A schematic diagram of the zeroing base of the detection fixture of the exemplary embodiment of this disclosure is shown;

[0032] Figure 11 A partial cross-sectional view of the detection fixture when it is zeroed according to an exemplary embodiment of the present disclosure is shown.

[0033] The following are the labels in the diagram: 1. Digital display; 2. Test base; 3. Fixing component; 4. Zeroing base; 5. Test piece; 11. Measuring section; 12. Dial; 21. Bearing section; 22. Support leg; 23. Test space; 41. Positioning reference surface; 42. Zeroing section; 211. Through hole; 221. Positioning surface; 231. First space; 232. Second space; 421. Zeroing surface. Detailed Implementation

[0034] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0035] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0036] Reference Figures 1-4 As shown, an exemplary embodiment of the present disclosure discloses a testing fixture including a digital display 1 and a testing base 2. The digital display 1 includes a measuring part 11, and the testing base 2 includes a supporting part 21 and two support legs 22 connected to the supporting part 21. A testing space 23 for testing a workpiece 5 is formed between the two support legs 22. The digital display 1 passes through the supporting part 21, and the measuring part 11 extends into the testing space 23. The support legs 22 include positioning surfaces 221 that contact the workpiece 5. The digital display 1 has a zeroing state and a measuring state. When the digital display 1 is in the zeroing state, the measuring part 11 is located at the first theoretical intersection of the extension lines of the two positioning surfaces 221. When the digital display 1 is in the measuring state, the measuring part 11 abuts against the rounded corner vertex of the workpiece 5.

[0037] In this embodiment, the digital display 1 can be, but is not limited to, a dial indicator or a micrometer, which can be adaptively selected according to the actual measurement accuracy requirements to facilitate user readings. The digital display 1 includes a dial 12 and a measuring unit 11. The dial 12 is used to display the measured value of the fullness of the rounded corner apex of the workpiece 5 when the digital display 1 is in the measurement state. The support leg 22 is provided with a positioning surface 221 that contacts the workpiece 5. The positioning surface 221 serves to provide a positioning reference for the workpiece 5 during the detection process. In actual use, one side of the workpiece 5 is first brought into contact with one of the two positioning surfaces 221, and then the other side of the workpiece 5 is brought close to the other positioning surface 221 to ensure measurement accuracy in each measurement. When the digital display 1 is in the zero state, the measuring unit 11 is located at the first theoretical intersection of the extension lines of the two positioning surfaces 221, which is the starting reference point of the entire measurement process. When the digital display 1 is in the measurement state, the measuring unit 11 is in contact with the fillet of the test piece 5, and directly obtains the measurement value of the fullness of the fillet vertex, thus realizing the effective detection of the fullness of the vertex.

[0038] Reference Figure 5 and Figure 6 As shown, the measurement principle of the testing fixture is as follows:

[0039] First, determine the design value of the fullness of the fillet vertex of the test piece 5 according to the following formula:

[0040]

[0041] Among them, A 设 Here, θ represents the design value for the fullness of the fillet vertex of the test piece 5, θ is the degree measure of the angle between the two positioning surfaces 221 at the first theoretical intersection point, and R is the radius of the fillet of the test piece 5. (Refer to...) Figure 6 As shown, taking the radius of the fillet of the test part 5 as R0.5 and θ as 90° as an example, the design value of the fullness of the fillet vertex of the test part 5 is:

[0042]

[0043] Then, the digital display 1 is operated to return it to zero. At this time, the bottom of the measuring part 11 of the digital display 1 is located at the first theoretical intersection of the extended lines of the two positioning surfaces 221 of the two legs 22. The purpose is to detect that when the base 2 and the two sides of the test piece 5 are in contact, the bottom of the measuring part 11 is also located at the intersection of the extended lines of the two rounded edges of the test piece 5. It is understood that there are multiple ways to zero the digital display 1. For example, the measuring part 11 can be manually returned to the zero position by using external tools, including but not limited to a measuring ruler; or the digital display 1 can be adjusted so that it can be automatically zeroed by pressing the zeroing button.

[0044] Next, place the testing base 2 against the large surface and side of the part to be tested 5, adjust the digital display 1 so that the measuring part 11 is in contact with the rounded corner vertex of the part to be tested 5, and read the measured value A of the fullness of the rounded corner vertex of the part to be tested 5. 测 Then, determine whether the measured value of the fullness of the rounded corner apex of the test piece 5 meets the production requirements.

[0045] The following formula can be used to determine whether the fillet radius of the test piece 5 meets the requirements:

[0046]

[0047] With the radius of the fillet of the test piece 5 as R0.5, θ as 90°, and A... 设 Taking a value of 0.21 as an example, when determining whether the fillet radius of the test part 5 meets the requirements, the following formula needs to be used for judgment:

[0048]

[0049] Where, if A 测 If the value is less than -0.21mm, it indicates that the fillet radius of the tested part 5 is greater than 0.5mm; if A 测 A value greater than -0.21mm indicates that the fillet radius of the test piece 5 is less than 0.5mm. It is understandable that the testing fixture is not only suitable for fillet testing at a standard 90° bending angle, but also, by adjusting the design of the support legs 22 of the testing base 2, can adapt to changes in the back-side structure, such as negative angles on the side. Furthermore, as long as the design value of the fillet vertex fullness of the test piece 5 is calculated accurately, it can be determined whether the fillet meets the requirements.

[0050] In summary, the testing fixture, through the combined use of the digital display 1 and the testing base 2, and by setting the positioning surface 221 and using the intersection of the extension line of the positioning surface 221 as the zeroing reference, can effectively measure the rounded corners of the workpiece 5. The user only needs to place the workpiece 5 in the testing space 23, ensuring it contacts the positioning surface 221, and then switch the digital display 1 from the zeroing state to the measurement state to obtain the measurement data, greatly improving testing efficiency. Furthermore, the structure of the testing fixture is not dependent on the shape and size of a specific product. By appropriately adjusting or replacing the testing base 2 according to different workpieces 5 and rounded corner specifications, it can be applied to the rounded corner testing of various products, demonstrating strong versatility.

[0051] Reference Figure 2 As shown, in one embodiment, the detection space 23 includes a first space 231 for accommodating the test piece 5 and a second space 232 for accommodating the rounded corners. The first space 231 and the second space 232 are connected. The second space 232 is formed at the bottom of the support portion 21, and the first theoretical intersection point is located within the second space 232.

[0052] In this embodiment, the design of the detection space 23 allows the test piece 5 to be stably placed within it. The first space 231 provides a placement space for the main body of the test piece 5, ensuring the overall stability of the test piece 5. The second space 232 is used to accommodate the rounded corner portion of the test piece 5. When the digital display 1 is in the zero-state, the first theoretical intersection point of the extended lines of the two positioning surfaces 221 where the measuring unit 11 is located is located within the second space 232, ensuring that the measuring unit 11 can accurately correlate with the rounded corner vertex of the test piece 5 during zeroing and measurement, thereby improving the accuracy of the measurement.

[0053] Reference Figure 3 As shown, in one embodiment, the support portion 21 has a through hole 211, and the measuring portion 11 is disposed in the through hole 211.

[0054] Furthermore, in one embodiment, the axis of the through hole 211 coincides with the angle bisector of the internal angle formed by the two positioning surfaces 221 at the first theoretical intersection point.

[0055] In this embodiment, the measuring unit 11 can be stably mounted on the support unit 21, ensuring the stability of the measuring unit 11's position during measurement and reducing measurement errors caused by the shaking or displacement of the measuring unit 11. The axis of the through hole 211 coincides with the angle bisector of the included angle formed by the two positioning surfaces 221 at the first theoretical intersection. When the measuring unit 11 is located inside the through hole 211, it can ensure that the measuring unit 11 maintains the optimal contact position with the rounded corner vertex of the workpiece 5 during measurement, thereby improving the accuracy of the measurement. Because of the characteristics of the angle bisector, the distance from the measuring unit 11 to the two positioning surfaces 221 is theoretically equal. No matter how the angle of the workpiece 5 changes, the measuring unit 11 can contact the workpiece 5 in a relatively symmetrical manner, reducing measurement errors caused by contact angle deviation.

[0056] Reference Figure 7 and Figure 8 As shown, in one embodiment, the testing fixture further includes a fixing member 3, which is disposed on the support portion 21. The fixing member 3 is adapted to the support portion 21 to jointly fix the digital display 1.

[0057] In this embodiment, the design and installation method of the fixing member 3 can be adapted to the shape and size of the digital display 1 to ensure that the digital display 1 is firmly installed on the support part 21 and to avoid shaking or displacement during the measurement process. For example, the fixing member 3 can be a sleeve that matches the shape of the housing of the digital display 1. The digital display 1 is tightly fixed to the support part 21 by the sleeve engaging with the slot on the support part 21; or, the fixing member 3 can be a clamping plate with bolts. The clamping plate is fixed to the support part 21 by bolts, thereby pressing the digital display 1.

[0058] Reference Figures 9-11 As shown, in one embodiment, the testing fixture further includes a zeroing base 4, which is detachably connected to the testing base 2. The zeroing base 4 is provided with two positioning reference surfaces 41 that correspond one-to-one with the two positioning surfaces 221. The included angle formed by the extension lines of the two positioning reference surfaces 41 is equal to the included angle formed by the extension lines of the two positioning surfaces 221.

[0059] In this embodiment, during the zeroing operation, the two support legs 22 of the detection base 2 are supported on the zeroing base 4, and the two positioning surfaces 221 are in contact with the two positioning reference surfaces 41 respectively. At this time, the digital display 1 is installed on the support part 21 of the detection base 2, enabling the measuring part 11 to work normally. Using the intersection of the extended lines of the positioning reference surfaces 41 of the zeroing base 4, the measuring part 11 of the digital display 1 is adjusted to be located at the intersection of the extended lines of the two positioning reference surfaces 41. This intersection corresponds to the first theoretical intersection of the extended lines of the two positioning surfaces 221, completing the zeroing operation and providing an accurate reference for subsequent measurements. The detection base 2 and the zeroing base 4 cooperate, using the positioning reference surfaces 41 for calibration, to more accurately determine the measurement starting position, that is, to position the measuring part 11 at the first theoretical intersection of the extended lines of the two positioning surfaces 221, ensuring the accuracy and consistency of each zeroing.

[0060] Specifically, in one embodiment, a zeroing unit 42 is provided on the zeroing base 4, which extends into the detection space 23 and is used to adjust the digital display 1 to the zeroing state.

[0061] In this embodiment, during the zeroing operation, the detection base 2 is placed on the zeroing base 4, so that the two positioning surfaces 221 contact the two positioning reference surfaces 41 respectively. At this time, the zeroing part 42 can cooperate with the measuring part 11 of the digital display 1 to adjust the digital display 1 to the zeroing state. Specifically, by designing the shape, size and position of the zeroing part 42, when it extends into the detection space 23 and interacts with the measuring part 11, it can accurately determine the starting position of the measurement, thereby achieving precise zeroing of the digital display 1.

[0062] Furthermore, in one embodiment, the zeroing unit 42 has a zeroing surface 421, and the second theoretical intersection point of the extension lines of the two positioning reference surfaces 41 is located on the zeroing surface 421.

[0063] In one embodiment, the measuring unit 11 has a zero position within the detection space 23. When the measuring unit 11 is in the zero position, it abuts against the zero surface 421.

[0064] In this embodiment, a zeroing unit 42 is provided on the zeroing base 4. The zeroing unit 42 has a zeroing surface 421, and the second theoretical intersection point of the extended lines of the two positioning reference surfaces 41 is located on the zeroing surface 421. During the zeroing operation, the detection base 2 is placed on the zeroing base 4, so that the two positioning surfaces 221 are in close contact with the two positioning reference surfaces 41 respectively. At this time, the zeroing unit 42 extends into the detection space 23, and the measuring unit 11 abuts against the zeroing surface 421. Since the second theoretical intersection point is located on the zeroing surface 421, when the measuring unit 11 contacts the zeroing surface 421, the starting position of the measurement can be accurately determined, thereby achieving accurate zeroing of the digital display 1. In the measurement state, the measuring unit 11 leaves the zeroing position and abuts against the rounded corner vertex of the test piece 5 to acquire measurement data.

[0065] In one possible implementation, the digital display 1 further includes a data processing module (not shown in the figure), which is configured to determine whether the fillet radius of the workpiece 5 under test is qualified based on the measurement result obtained by the digital display 1 in the measurement state.

[0066] In this embodiment, before use, the operator can input the following formula for determining whether the fillet radius of the test piece 5 is qualified into the data processing module:

[0067]

[0068] Among them, A 设 A is the design value for the fullness of the fillet apex of part 5 under test. 测 This is the measured value of the fullness of the fillet apex of part 5 under test. It should be noted that this is only to provide the design principle; in actual operation, A... 设 Both tolerance and bandwidth require specific values ​​to be input into the data processing module.

[0069] After the measuring unit 11 acquires the measurement data, the data processing module determines whether the data meets the requirements according to the above formula. If the measurement data is within the tolerance range, the fillet is deemed qualified; if the measurement data exceeds the tolerance range, the fillet is deemed unqualified. The data processing module can implement logical judgment functions through programming, and the judgment results can be intuitively displayed to the operator through the dial 12 of the digital display 1 or indicator lights. Therefore, the data processing module can automatically determine whether the fillet is qualified based on the measurement results, eliminating the need for manual comparison and judgment by the operator, greatly shortening the inspection time, improving inspection efficiency, and avoiding judgment errors and inconsistencies in standards caused by human factors. This ensures the accuracy and reliability of the inspection results and improves the level of product quality control. The operator only needs to place the part to be measured 5 in the inspection space 23 for measurement, and the data processing module will automatically complete the judgment and output the results, reducing the requirements for the operator's professional skills.

[0070] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0071] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," and "above" are used herein to describe the spatial positional relationship between one or more components or features shown in the figures and other components or features. It should be understood that spatial relative terms include not only the orientation of the component as depicted in the figures but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0072] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0073] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in sequences other than those illustrated or described herein.

[0074] This disclosure has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this disclosure to the described embodiments. Furthermore, those skilled in the art will understand that this disclosure is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this disclosure, all of which fall within the scope of protection claimed by this disclosure. The scope of protection of this disclosure is defined by the appended claims and their equivalents.

Claims

1. A testing fixture, characterized in that, include: Digital display (1), including measuring unit (11); as well as The testing base (2) includes a support part (21) and two support legs (22) connected to the support part (21). A testing space (23) for testing the test piece (5) is formed between the two support legs (22). The digital display (1) passes through the support part (21) and the measuring part (11) extends into the testing space (23). The support leg (22) includes a positioning surface (221) that contacts the test piece (5). The digital display (1) has a zeroing state and a measurement state. When the digital display (1) is in the zeroing state, the measuring part (11) is located at the first theoretical intersection of the extension lines of the two positioning surfaces (221). When the digital display (1) is in the measurement state, the measuring part (11) abuts against the rounded corner vertex of the test piece (5).

2. The testing fixture according to claim 1, characterized in that, The detection space (23) includes a first space (231) for accommodating the test piece (5) and a second space (232) for accommodating the rounded corner. The first space (231) and the second space (232) are connected. The second space (232) is formed at the bottom of the support part (21). The first theoretical intersection point is located in the second space (232).

3. The testing fixture according to claim 1, characterized in that, The bearing part (21) has a through hole (211), and the measuring part (11) is disposed in the through hole (211).

4. The testing fixture according to claim 3, characterized in that, The axis of the through hole (211) coincides with the angle bisector of the internal angle formed by the two positioning surfaces (221) at the first theoretical intersection point.

5. The testing fixture according to claim 1, characterized in that, It also includes a fastener (3) disposed on the support part (21), the fastener (3) being adapted to the support part (21) to jointly fix the digital display (1).

6. The testing fixture according to claim 1, characterized in that, It also includes a zeroing base (4), which is detachably connected to the detection base (2). The zeroing base (4) is provided with two positioning reference surfaces (41) that correspond one-to-one with the two positioning surfaces (221). The included angle formed by the extension lines of the two positioning reference surfaces (41) is equal to the included angle formed by the extension lines of the two positioning surfaces (221).

7. The testing fixture according to claim 6, characterized in that, The zeroing base (4) is provided with a zeroing part (42), which extends into the detection space (23) and is used to adjust the digital display (1) to the zeroing state.

8. The testing fixture according to claim 7, characterized in that, The zeroing section (42) has a zeroing surface (421), and the second theoretical intersection point of the extension lines of the two positioning reference surfaces (41) is located on the zeroing surface (421).

9. The testing fixture according to claim 8, characterized in that, The measuring unit (11) has a zero position in the detection space (23). When the measuring unit (11) is in the zero position, the measuring unit (11) abuts against the zero surface (421).

10. The testing fixture according to claim 1, characterized in that, The digital display (1) also includes a data processing module, which is configured to determine whether the fillet is qualified based on the measurement result obtained by the digital display (1) in the measurement state.

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