Inspection tooling

Abstract

This utility model discloses a testing fixture for inspecting a battery pack mounting frame. The battery pack mounting frame includes at least one mounting platform for mounting the battery pack. The mounting platform includes multiple mounting plates, each with multiple first mounting portions. The battery pack has multiple second mounting portions that mate with the first mounting portions. The testing fixture includes a testing bracket and multiple testing portions connected to the testing bracket. The relative positional characteristics between the multiple testing portions are the same as the relative positional characteristics between the multiple second mounting portions, allowing the matching relationship between the multiple first mounting portions and the multiple second mounting portions to be detected through the multiple testing portions. According to the testing fixture of this utility model, by ensuring that the relative positional characteristics between the multiple testing portions are the same as the relative positional characteristics of the multiple second mounting portions, the position of the multiple first mounting portions can be detected, improving the efficiency and accuracy of inspecting the battery pack mounting frame, thereby improving the reliability of manual inspection.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, and in particular to a testing tooling. Background Technology

[0002] In related technologies, battery packs are usually fixed to the vehicle body by battery pack mounting frames. The installation accuracy can effectively improve the overall manufacturing efficiency and product quality. The requirements for the dimensional accuracy of the battery pack mounting frames are particularly strict. Once the deviation exceeds the preset value, it will cause great difficulties for the overall installation and seriously affect the overall efficiency. However, the deviation is an unavoidable problem. The quality inspection of battery pack frames relies on manual inspection one by one, which has problems such as low efficiency, waste of human resources, and poor accuracy. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a testing fixture that detects the position of multiple first mounting parts by using the same relative positional characteristics between multiple testing parts as between multiple second mounting parts, thereby improving the testing efficiency and accuracy of the battery pack mounting frame and thus enhancing the reliability of manual testing.

[0004] According to an embodiment of the present invention, a testing fixture is used to test a battery pack mounting frame. The battery pack mounting frame includes at least one mounting platform for mounting the battery pack. The mounting platform includes multiple mounting plates, each mounting plate having multiple first mounting portions. The battery pack has multiple second mounting portions that cooperate with the first mounting portions. The testing fixture includes: a testing bracket; and multiple testing portions connected to the testing bracket. The relative positional characteristics between the multiple testing portions are the same as the relative positional characteristics between the multiple second mounting portions, so as to detect the matching relationship between the multiple first mounting portions and the multiple second mounting portions through the multiple testing portions.

[0005] According to the inspection fixture of this utility model embodiment, the battery pack cooperates with the first mounting parts of the mounting platform through multiple second mounting parts to install the battery pack onto the mounting platform. By using the fact that the relative positional characteristics between the multiple inspection parts of the inspection fixture are the same as the relative positional characteristics between the multiple second mounting parts, the position of the multiple first mounting parts is detected, thereby improving the inspection efficiency and accuracy of the battery pack mounting frame, and thus improving the reliability of manual inspection.

[0006] According to some embodiments of the present invention, the first mounting part includes a first mounting hole, the second mounting part includes a second mounting hole opposite to the first mounting hole, the detection part includes a detection hole, and the detection fixture is adapted to detect the matching relationship between a plurality of first mounting holes and a plurality of second mounting holes through the detection hole.

[0007] According to some embodiments of the present invention, the testing fixture further includes: a ball bearing, which is movably disposed in the testing hole. The upper and lower openings of the testing hole are respectively provided with a first limiting part and a second limiting part to limit the relative position of the ball bearing in the testing hole, so that a portion of the ball bearing is suitable to extend out of the testing hole.

[0008] According to some embodiments of this utility model, the ball has a free state and a limited state. In the free state, the ball is adapted to move within the detection hole. In the limited state, the upper and lower ends of the ball abut against the first limiting part and the mounting plate, respectively. In the free state, the ball includes a first part extending downward beyond the detection hole, and the radius of the projection of the first part onto the horizontal plane is r1. In the limited state, the ball includes a second part extending downward beyond the detection hole, and the radius of the projection of the second part onto the horizontal plane is r2, satisfying r1-r2≤2mm.

[0009] According to some embodiments of the present invention, the first limiting part includes: a limiting plate, the limiting plate being located above the detection hole, the limiting plate having a movable hole opposite to the detection hole, the diameter of the movable hole being smaller than the diameter of the ball, and a portion of the ball being adapted to extend through the movable hole.

[0010] According to some embodiments of the present invention, the second limiting part includes: an annular rib, the annular rib being disposed on the inner peripheral wall of the detection hole, and the inner diameter of the annular rib being smaller than the diameter of the ball.

[0011] According to some embodiments of the present invention, the testing fixture further includes a positioning part, which is positioned and engaged with the first mounting hole.

[0012] According to some embodiments of the present invention, the testing fixture further includes: multiple testing plates, all of which are detachably connected to the testing bracket, each testing plate having multiple testing holes, and at least one testing plate having the positioning part.

[0013] According to some embodiments of the present invention, the side of the detection plate facing the mounting plate is a first side, which is a plane, and the side of the mounting plate facing the detection fixture is a second side, so as to detect the flatness of the second side through the relative gap between the second side and the first side.

[0014] According to some embodiments of the present invention, the detection bracket includes multiple connecting plates, and the multiple detection plates are connected to the connecting plates one-to-one, and the detection plates are detachably connected to the lower side of the connecting plates.

[0015] 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

[0016] 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:

[0017] Figure 1 This is a schematic diagram of the testing fixture located on the mounting platform according to some embodiments of the present utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of a testing fixture according to some embodiments of the present utility model;

[0020] Figure 4 yes Figure 3 Enlarged view at point B in the middle;

[0021] Figure 5 This is a schematic diagram of the testing fixture according to some embodiments of the present invention from another direction.

[0022] Figure label:

[0023] 10. Battery pack mounting frame; 1. Mounting platform; 11. Support beam; 12. Mounting diagonal beam; 13. Mounting longitudinal beam; 14. Mounting transverse beam; 15. Connecting beam; 16. Fixing plate; 17. Mounting plate; 171. First mounting hole; 172. Second side;

[0024] 20. Testing fixtures;

[0025] 2. Inspection bracket; 21. Tooling crossbeam; 22. Tooling longitudinal beam; 221. Weight reduction hole; 23. Connecting bracket; 24. Installation handle; 25. Indicator mark;

[0026] 3. Detection plate; 31. First side surface; 32. Detection hole; 33. Ball bearing; 34. Annular rib; 35. Limiting plate; 351. Movable hole; 36. Rotary plunger;

[0027] 41. Connecting plate; 42. Bolt. Detailed Implementation

[0028] 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.

[0029] The following is for reference. Figures 1-5 The inspection fixture 20 according to an embodiment of the present utility model is described.

[0030] According to the embodiment of this utility model, the testing fixture 20 is used to test the battery pack mounting frame 10. The battery pack mounting frame 10 includes at least one mounting platform 1 for mounting battery packs. The battery pack mounting frame 10 may include one mounting platform 1 or multiple mounting platforms 1, which can be stacked vertically. At least one battery pack can be placed on each mounting platform 1, meaning one or more battery packs can be placed on each mounting platform 1. If multiple battery packs are placed on each mounting platform 1, they can be placed side-by-side along a planar direction.

[0031] Each mounting platform 1 includes two longitudinal mounting beams 13 and multiple transverse mounting beams 14. Multiple transverse mounting beams 14 connect the two longitudinal mounting beams 13. Connecting beams 15 are also connected at the corners of the longitudinal and transverse mounting beams 13 to support the longitudinal and transverse mounting beams 13 and 14. Support beams 11 are provided circumferentially on the mounting platform 1, extending vertically. Multiple support beams 11 are provided to connect multiple mounting platforms 1. Diagonal mounting beams 12 are connected between adjacent support beams 11 to increase their structural strength. Fixing plates 16 are connected between adjacent mounting platforms 1 to further increase their structural strength.

[0032] The mounting platform 1 includes multiple mounting plates 17, which can be connected to the inner side of the mounting longitudinal beams 13. The inner side of the mounting longitudinal beams 13 is the side of one mounting longitudinal beam 13 facing another. The multiple mounting plates 17 can be spaced apart along the length of the mounting longitudinal beams 13. Each mounting plate 17 is provided with multiple first mounting parts. The number of first mounting parts on each mounting plate 17 can be the same or different.

[0033] The battery pack has multiple second mounting parts, which correspond one-to-one with multiple first mounting parts for mounting the battery pack on the mounting platform 1. Before installing the battery pack, the position of the first mounting parts needs to be checked to avoid any misalignment between the second mounting parts and their corresponding first mounting parts, which could prevent the battery pack from being installed.

[0034] The testing fixture 20 proposed in this embodiment can be used to detect the position of the first mounting portion relative to the second mounting portion on the battery pack mounting frame 10. The testing fixture 20 includes a testing bracket 2 and multiple testing portions connected to the testing bracket 2, which serves to fix the multiple testing portions. The relative positional characteristics between the multiple testing portions are the same as those between the multiple second mounting portions; that is, the multiple testing portions can be analogous to the multiple second mounting portions of the battery pack. For example, the distance between the multiple testing portions is the same as the distance between the multiple second mounting portions, or the relative positions between the multiple testing portions are the same as the relative positions between the multiple second mounting portions.

[0035] The inspection unit is used to inspect multiple second mounting parts of the battery pack. By placing the inspection fixture 20 on the mounting platform 1 and making multiple inspection parts correspond one-to-one with multiple first mounting parts, the operator inspects the matching relationship between the multiple first mounting parts and the multiple second mounting parts to confirm whether the multiple first mounting parts of the mounting platform 1 meet the standards for installing the battery pack. This improves the inspection efficiency and accuracy of the battery pack mounting frame 10, thereby improving the reliability of manual inspection.

[0036] After the testing fixture 20 is placed on the installation platform 1, if the positions of multiple testing parts can correspond one-to-one with the positions of multiple first mounting parts, achieving the target matching relationship, that is, the positions of multiple first mounting parts can correspond one-to-one with the positions of multiple second mounting parts of the battery pack, then when the battery pack is installed on the installation platform 1, the multiple second mounting parts of the battery pack can be accurately installed on the corresponding multiple first mounting parts.

[0037] After the testing fixture 20 is placed on the installation platform 1, if the positions of multiple testing units cannot correspond one-to-one with the positions of multiple first installation units and the target matching relationship is not achieved, a review will be organized to further test the positions of the first installation units.

[0038] Optionally, both the first mounting part and the second mounting part can be mounting holes, and correspondingly, the detection part can be a mounting hole.

[0039] Optionally, the first mounting part can be a mounting hole, and the second mounting part can be a mounting bolt. Correspondingly, the detection part can be a mounting bolt.

[0040] According to the detection fixture 20 of this utility model embodiment, the battery pack cooperates with the multiple first mounting parts of the mounting platform 1 through multiple second mounting parts to install the battery pack onto the mounting platform 1. The position of the multiple first mounting parts is detected by the fact that the relative position characteristics between the multiple detection parts of the detection fixture 20 are the same as the relative position characteristics between the multiple second mounting parts, thereby improving the detection efficiency and detection accuracy of the battery pack mounting frame 10, and thus improving the reliability of manual inspection.

[0041] According to some embodiments of this utility model, refer to Figures 1-4 The first mounting part includes a first mounting hole 171, the second mounting part includes a second mounting hole, the second mounting hole is opposite to the first mounting hole 171, the detection part includes a detection hole 32, the relative position characteristics between the plurality of detection holes 32 are the same as the relative position characteristics between the plurality of second mounting holes, and the detection fixture 20 is adapted to detect the matching relationship between the plurality of first mounting holes 171 and the plurality of second mounting holes through the detection hole 32.

[0042] After the testing fixture 20 is placed on the mounting platform 1, if the positions of the multiple testing holes 32 correspond one-to-one with the positions of the multiple first mounting holes 171, that is, the positions of the multiple first mounting holes 171 correspond one-to-one with the positions of the multiple second mounting holes of the battery pack, then when the battery pack is installed on the mounting platform 1, by accurately aligning the multiple second mounting holes of the battery pack with the corresponding multiple first mounting holes 171, and then using bolts 42 to pass through the first mounting holes 171 and the second mounting holes, the battery pack can be accurately installed on the mounting platform 1.

[0043] After the testing fixture 20 is placed on the mounting platform 1, if the multiple testing holes 32 cannot correspond one-to-one with the positions of the multiple first mounting holes 171, a review is organized to further test the positions of the first mounting holes 171.

[0044] According to some embodiments of this utility model, refer to Figures 3-4The testing fixture 20 also includes a ball bearing 33, which is spherical and has a hollow interior to reduce its weight. The ball bearing 33 is movably disposed within each testing hole 32, with one ball bearing 33 in each hole. The testing fixture 20 is placed above the mounting platform 1, with the lower opening of the testing hole 32 facing the mounting platform 1. A first limiting part and a second limiting part are respectively provided at the upper and lower openings of the testing hole 32 to restrict the relative position of the ball bearing 33 within the testing hole 32. This not only prevents the ball bearing 33 from detaching from the testing hole 32 but also allows some of the ball bearing 33 to extend out of the testing hole 32.

[0045] When the positions of multiple detection holes 32 and multiple first mounting holes 171 deviate, the sidewall of the first mounting hole 171 drives the ball bearing 33 to move upward, causing the upper part of the ball bearing 33 to lock against the first limiting part. This prevents the ball bearing 33 from moving easily when touched by an operator. When the positions of the multiple detection holes 32 and multiple first mounting holes 171 are aligned one-to-one, the upper part of the ball bearing 33 will not lock against the first limiting part, and the ball bearing 33 can rotate normally when touched by an operator.

[0046] The matching relationship between the positions of multiple detection holes 32 and multiple first mounting holes 171 is determined by touching whether the ball bearing 33 rotates. This solves the problems of cumbersome detection steps and poor accuracy, greatly speeds up the detection process, and saves manpower.

[0047] After the testing fixture 20 is placed on the installation platform 1, the operator touches the ball bearing 33. If the ball bearing 33 rotates normally, then the multiple first mounting holes 171 of the installation platform 1 meet the standard for installing the battery pack; that is, the multiple testing holes 32 can be matched one-to-one with the positions of the multiple first mounting holes 171. When the battery pack is installed on the installation platform 1, by accurately aligning the multiple second mounting holes of the battery pack with the corresponding multiple first mounting holes 171, and then using bolts 42 to pass through the first mounting holes 171 and the second mounting holes, the battery pack can be accurately installed on the installation platform 1. If the ball bearing 33 is stuck and cannot rotate, then there is a deviation between the positions of the multiple first mounting holes 171 and the positions of the multiple testing holes 32, and the multiple first mounting holes 171 of the installation platform 1 do not meet the standard for installing the battery pack, requiring a review.

[0048] According to some embodiments of this utility model, refer to Figures 1-4 The ball 33 has a free state and a limited state. In the free state, the ball 33 is suitable for moving within the detection hole 32. In the limited state, the upper and lower ends of the ball 33 abut against the first limiting part and the mounting plate 17 respectively. When the operator touches the ball 33, the ball 33 is not easy to rotate.

[0049] In the free state, the ball 33 includes a first part extending downward beyond the detection hole 32. In the radial direction, the radius of the projection of the first part onto the horizontal plane is r1. In the limited state, the ball 33 includes a second part extending downward beyond the detection hole 32. In the radial direction, the radius of the projection of the second part onto the horizontal plane is r2, satisfying r1-r2≤2mm. When the ball 33 moves from the free state to the limited state, the ball 33 can only move 2mm along the horizontal plane. When the detection fixture 20 detects, it can accept a tolerance of 2mm between the first mounting hole 171 and the second mounting hole. Within this tolerance range, the battery pack can be installed on the mounting platform 1.

[0050] According to some embodiments of this utility model, refer to Figures 1-4 The first limiting part further includes a limiting plate 35, which is located above the detection hole 32. The limiting plate 35 has a movable hole 351 opposite to the detection hole 32. The diameter of the movable hole 351 is smaller than the diameter of the ball 33, and part of the ball 33 is adapted to extend upward through the movable hole 351. By setting the limiting plate 35 above the detection hole 32 to limit the position of the ball 33, the setting method of the first limiting part can be simplified.

[0051] According to some embodiments of this utility model, refer to Figures 1-4 The second limiting part includes an annular rib 34, which is disposed on the inner peripheral wall of the detection hole 32. The inner diameter of the annular rib 34 is smaller than the diameter of the ball 33, so that a portion of the ball 33 can protrude from the opening at the lower end of the detection hole 32. By providing an annular rib 34 on the inner peripheral wall of the detection hole 32 to limit the position of the ball 33, the arrangement of the second limiting part can be simplified.

[0052] According to some embodiments of this utility model, refer to Figures 1-3 The testing fixture 20 also includes a positioning part, which is positioned and cooperates with the first mounting hole 171 to improve the accuracy of the position of the testing fixture 20 when it is placed on the mounting platform 1.

[0053] For example, the positioning part includes a positioning pin that can extend into the first mounting hole 171. The testing fixture 20 is first placed on the mounting platform 1, and the testing fixture 20 is moved back and forth and left and right until the positioning pin falls into the first mounting hole 171, which is used to fix the testing fixture 20 to the mounting platform 1.

[0054] For example, the positioning part includes a knob plunger, which includes a housing, a knob, a spring pin, and a plunger rod. The knob, spring pin, and plunger rod are all located inside the housing, and the knob and plunger rod can extend out of the housing. The spring pin is disposed between the knob and the plunger rod. The knob has a locked state and an unlocked state. In the locked state, the plunger rod extends out of the housing; in the unlocked state, the spring pin drives the plunger rod to retract into the housing. The rotary plunger 36 is opened to the extended state, and then the detection fixture 20 is placed on the mounting platform 1. The detection fixture 20 is moved back and forth and left and right until the plunger rod falls into the first mounting hole 171, which is used to fix the detection fixture 20 to the mounting platform 1.

[0055] According to some embodiments of this utility model, refer to Figures 3-5 The testing fixture 20 also includes: multiple testing plates 3, which are detachably connected to the testing bracket 2. Each testing plate 3 is provided with multiple testing holes 32, and at least one testing plate 3 is provided with a positioning part. By providing testing holes 32 and positioning parts on the testing plate 3, the arrangeability of testing holes 32 and positioning parts is improved.

[0056] For example, the testing bracket 2 includes a tooling crossbeam 21 and tooling longitudinal beams 22. Two tooling longitudinal beams 22 are provided, and the tooling crossbeam 21 connects the two tooling longitudinal beams 22. A connecting bracket 23 is provided at the corner of the tooling crossbeam 21 and the tooling longitudinal beams 22 to increase the structural strength when the tooling crossbeam 21 and the tooling longitudinal beams 22 are connected. Each tooling longitudinal beam 22 and tooling crossbeam 21 is provided with multiple weight-reducing holes 221 to reduce the weight of the testing bracket 2. Multiple detection plates 3 are detachably connected to the outside of the tooling longitudinal beam 22. The outside of the tooling longitudinal beam 22 is the side of one tooling longitudinal beam 22 that is away from another tooling longitudinal beam 22. Each tooling longitudinal beam 22 is connected to three detection plates 3. The three detection plates 3 are spaced apart along the extension direction of the tooling longitudinal beam 22. The detection plates 3 connected to the two tooling longitudinal beams 22 are symmetrically arranged. The two detection plates 3 are located at the two ends of the tooling longitudinal beam 22, and one detection plate 3 is located in the middle of the tooling longitudinal beam 22.

[0057] The detection plate 3 located at one end of the detection bracket 2 has a positioning part and two detection holes 32. The positioning part is located at the end of the detection hole 32 near the detection bracket 2. The other two detection plates 3 have three detection holes 32.

[0058] One end of the tooling longitudinal beam 22 is provided with an indicator mark 25 to guide the installation direction of the testing tool 20. The indicator mark 25 is an arrow, and the direction of the arrow indicates the installation direction of the testing tool 20. Installation handles 24 are installed at the upper ends of both tooling longitudinal beams 22 to facilitate the transfer and carrying of the testing tool 20.

[0059] For example, the limiting plate 35 is detachably connected to the detection plate 3. After the ball 33 is placed into the detection hole 32, the limiting plate 35 is fixed to the detection plate 3 with bolts 42 to fix the ball 33.

[0060] According to some embodiments of this utility model, refer to Figures 3-5 The side of the detection plate 3 facing the mounting plate 17 is the first side 31, which is a plane. The side of the mounting plate 17 facing the detection fixture 20 is the second side 172. The flatness of the second side 172 is detected by the relative gap between the second side 172 and the first side 31. Flatness is an index that measures the degree of deviation between a second side 172 and its ideal plane.

[0061] After the inspection fixture 20 is placed on the mounting platform 1, multiple inspection plates 3 are located on the mounting plate 17. A feeler gauge is inserted between the inspection plate 3 and the mounting plate 17 to measure the gap height between the second side 172 and the first side 31. This data is the flatness data.

[0062] For example, there are six detection plates 3, and feeler gauges are used to sequentially detect the gap height between the detection plates 3 and the mounting plate 17.

[0063] According to some embodiments of this utility model, refer to Figures 3-5 The testing bracket 2 includes multiple connecting plates 41, and multiple testing plates 3 are connected to the connecting plates 41 one by one. The testing plates 3 are detachably connected to the lower side of the connecting plates 41. By replacing the testing plates 3, different testing sections can be set up to test different specifications of the installation platform 1, which improves the practicality of the testing fixture 20.

[0064] For example, the connecting plate 41 is connected to the lower part of the tooling longitudinal beam 22, while part of the detection plate 3 is connected to the lower part of the connecting plate 41 to reduce the thickness of the detection plate 3.

[0065] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A testing fixture (20) for testing a battery pack mounting frame (10), characterized in that, The battery pack mounting frame (10) includes at least one mounting platform (1) for mounting the battery pack. The mounting platform (1) includes multiple mounting plates (17). Each mounting plate (17) has multiple first mounting portions. The battery pack has multiple second mounting portions that mate with the first mounting portions. The testing fixture (20) includes: Detection bracket (2); Multiple detection units are connected to the detection bracket (2). The relative positional characteristics between the multiple detection units are the same as the relative positional characteristics between the multiple second mounting units, so as to detect the matching relationship between the multiple first mounting units and the multiple second mounting units through the multiple detection units.

2. The testing fixture (20) according to claim 1, characterized in that, The first mounting part includes a first mounting hole (171), the second mounting part includes a second mounting hole opposite to the first mounting hole (171), the detection part includes a detection hole (32), and the detection fixture (20) is adapted to detect the matching relationship between a plurality of first mounting holes (171) and a plurality of second mounting holes through the detection hole (32).

3. The testing fixture (20) according to claim 2, characterized in that, Also includes: A ball (33) is movably disposed in the detection hole (32). The upper and lower ends of the detection hole (32) are respectively provided with a first limiting part and a second limiting part to limit the relative position of the ball (33) in the detection hole (32), so that a portion of the ball (33) is suitable to extend out of the detection hole (32).

4. The testing fixture (20) according to claim 3, characterized in that, The ball (33) has a free state and a limited state. In the free state, the ball (33) is adapted to move within the detection hole (32). In the limited state, the upper and lower ends of the ball (33) abut against the first limiting part and the mounting plate (17) respectively. In the free state, the ball (33) includes a first part extending downward outside the detection hole (32), and the radius of the projection of the first part onto the horizontal plane is r1 in the radial direction. In the limited state, the ball (33) includes a second part extending downward outside the detection hole (32), and the radius of the projection of the second part onto the horizontal plane is r2 in the radial direction, satisfying r1-r2≤2mm.

5. The testing fixture (20) according to claim 3, characterized in that, The first limiting part includes: a limiting plate (35) located above the detection hole (32), the limiting plate (35) having a movable hole opposite to the detection hole (32), the diameter of the movable hole being smaller than the diameter of the ball (33), and a portion of the ball (33) being adapted to extend through the movable hole.

6. The testing fixture (20) according to claim 3, characterized in that, The second limiting part includes an annular rib (34), which is disposed on the inner peripheral wall of the detection hole (32), and the inner diameter of the annular rib (34) is smaller than the diameter of the ball (33).

7. The testing fixture (20) according to claim 2, characterized in that, Also includes: The positioning part is positioned and engaged with the first mounting hole (171).

8. The testing fixture (20) according to claim 7, characterized in that, Also includes: Multiple detection plates (3) are detachably connected to the detection bracket (2). Each detection plate (3) is provided with multiple detection holes (32), and at least one detection plate (3) is provided with the positioning part.

9. The testing fixture (20) according to claim 8, characterized in that, The side of the detection plate (3) facing the mounting plate (17) is the first side (31), which is a plane. The side of the mounting plate (17) facing the detection fixture (20) is the second side (172), so that the flatness of the second side (172) can be detected through the relative gap between the second side (172) and the first side (31).

10. The testing fixture (20) according to claim 8, characterized in that, The detection bracket (2) includes multiple connecting plates (41), and multiple detection plates (3) are connected to the connecting plates (41) one by one, and the detection plates (3) are detachably connected to the lower side of the connecting plates (41).

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