A folding terminal lens module fixture

Abstract

The embodiment of the present application provides a folding terminal lens module jig, which relates to the field of terminal equipment technology, and can simulate the installation and use environment of the folding terminal, and perform relevant tests on the lens module of the folding terminal. The folding terminal lens module jig includes: an upper jig, on which an upper mounting groove is provided; a lower jig, on which a lower mounting groove is provided; a rotating mechanism, through which the upper jig and the lower jig are foldably connected; when the upper jig and the lower jig are in a folded state, the upper mounting groove and the lower mounting groove are aligned and snapped together, and the openings are opposite, and the upper mounting groove and the lower mounting groove form a lens module mounting cavity. The folding terminal lens module jig provided in the embodiment of the present application can be used for testing the folding terminal lens module.

Description

Technical Field

[0001] The present application relates to the technical field of terminal equipment, and in particular to a foldable terminal lens module fixture. Background Art

[0002] In the production and manufacturing of terminal equipment, each component needs to be tested or experimented during installation and production to ensure that its appearance or performance meets the relevant requirements. In this case, a fixture is needed, which can test the appearance or performance of the components.

[0003] The terminals currently in use are generally equipped with lens modules, and the lens modules are often subjected to a drop test before installation. The drop test is to test the quality of the lens module by allowing the lens module to fall freely at a certain height from a falling surface.

[0004] With the development of science and technology, terminal devices have more and more functions and forms. For example, mobile phone terminals used for communication have foldable forms. When a foldable phone is unfolded, the display screen can be multiplied, which greatly meets the user's display requirements. However, the lens module fixtures of current terminal devices are only designed and tested for individual components or for the state of non-folding terminals. There is no lens module fixture specifically for folding terminals. Summary of the invention

[0005] The embodiments of the present application provide a foldable terminal lens module jig, which can simulate the installation and use environment of a foldable terminal and perform relevant tests on the lens module of the foldable terminal.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] An embodiment of the present application provides a foldable terminal lens module jig, including: an upper jig, on which an upper mounting groove is provided; a lower jig, on which a lower mounting groove is provided; a rotating mechanism, through which the upper jig and the lower jig are foldably connected; when the upper jig and the lower jig are in a folded state, the upper mounting groove and the lower mounting groove are aligned and snapped together, and the openings are opposite, and the upper mounting groove and the lower mounting groove form a lens module mounting cavity.

[0008] The folding terminal lens module of the embodiment of the present application can simulate the installation and use environment of the folding terminal, and then relevant tests can be performed on the lens module of the folding terminal, because the upper jig and the lower jig are foldably connected by a rotating mechanism, and the lens module installation cavity formed when the upper jig and the lower jig are in a folded state can accommodate the lens module.

[0009] In a first possible implementation, the rotating mechanism is a rotating shaft, and one side of the upper fixture and one side of the lower fixture are hinged by the rotating shaft. The rotating mechanism can be implemented in a variety of ways, for example, the rotating mechanism can be a flexible connector or a rotating shaft. Among them, the flexible connector needs to be made of flexible material, and the material strength itself is low, while in the rotating shaft solution, the strength of the rotating shaft can be well guaranteed, and it is easy to manufacture and has a low cost.

[0010] In a second possible implementation, the lens module mounting cavity is provided with an adhesive, and the adhesive is used to bond and fix the lens module located in the lens module mounting cavity. When the lens module is installed in the lens module mounting cavity and tested, shaking may occur due to the existence of the installation gap, thereby affecting the final test results. Therefore, an adhesive is provided in the lens module mounting cavity, and the lens module located in the lens module mounting cavity can be bonded and fixed, avoiding the problem that the lens module shakes during the test and affects the test results. In addition, since the lens module needs to be taken out of the lens module mounting cavity after the test is completed and may be installed in the product, the adhesive is used for temporary bonding and fixation.

[0011] In a third possible implementation, the adhesive member is a double-sided adhesive layer disposed in the lens module mounting cavity.

[0012] In a fourth possible implementation, the lens module includes a lens barrel and a lens disposed in the lens barrel, and the adhesive is used to bond and fix the lens barrel to the inner wall of the lens module mounting cavity. The lens module includes a lens barrel and a lens fixed in the lens barrel. For different lens modules, the shape and structure of the lens barrel and the lens may be different. In order to avoid the adhesive being bonded to the lens and affecting the optical performance of the lens, the adhesive should be bonded to the lens barrel.

[0013] In a fifth possible implementation, a flexible buffer layer is provided between the inner wall of the lens module mounting cavity and the lens module located in the lens module mounting cavity. There is an installation gap between the inner wall of the lens module mounting cavity and the lens module located in the lens module mounting cavity. In order to eliminate the gap and further prevent the lens module from shaking in the lens module mounting cavity, a flexible buffer layer is provided, and the flexible buffer layer may be a foam layer.

[0014] In the sixth possible implementation, a heating module is also included, and the heating module is used to heat the lens module installation cavity. During the use of the terminal, the heating of the electronic components will cause the entire device to heat up, so the lens module may work in a heated environment. In this way, in order to test the reliability of the lens module in a heated environment of the terminal, a heating module is also provided, and the heating module can heat the lens module installation cavity, so that the lens module can be in a heated environment during the use of the terminal, and then the reliability of the lens module can be more comprehensively tested.

[0015] In the seventh possible implementation, the upper fixture corresponds to the upper mounting slot, and the lower fixture corresponds to the lower mounting slot. Both observation partitions made of transparent materials are provided. The terminal lens module includes an ordinary lens module and a liquid lens module. Among them, the structure of the ordinary lens module is solid. After the drop or tumble test, there is generally no abnormality in the appearance. Therefore, for the test of the ordinary lens module, the commonly used method is: before loading into the fixture, the optical performance indicators of the ordinary lens module are measured and recorded, and then the ordinary lens module is installed in the fixture, and the drop or tumble test is performed. Finally, the ordinary lens module is taken out, and the optical performance indicators are measured again, and compared with the previous measurement results to see whether it is within the effective range of variation, and then determine whether it meets the standard. The structure of the liquid lens module is liquid. After the drop or tumble test, its integrity can be directly observed from the appearance. Therefore, in order to facilitate the testing of the liquid lens module, observation partitions made of transparent material can be set at the position of the upper fixture corresponding to the upper mounting groove, and the position of the lower fixture corresponding to the lower mounting groove. In this way, it is possible to directly observe from the outside of the fixture whether the liquid lens module is intact after the test without opening the fixture.

[0016] In an eighth possible implementation, both the upper jig and the lower jig are made of transparent materials. In order to facilitate observation of the situation in the lens module installation cavity, a transparent observation partition can be provided at the position of the upper jig corresponding to the upper installation groove, and at the position of the lower jig corresponding to the lower installation groove. Similarly, the upper jig and the lower jig can be directly made of transparent materials, which can also facilitate observation of the situation in the lens module installation cavity.

[0017] In a ninth possible implementation, the transparent material includes glass or plastic. The transparent material can be made into an observation partition, or into an upper fixture and a lower fixture.

[0018] In the tenth possible implementation, when the upper jig and the lower jig are in a folded state, a counterweight groove is formed in the upper jig and the lower jig, and a counterweight block is arranged in the counterweight groove, and the counterweight block is used to adjust the overall mass of the upper jig and the lower jig after being folded. The mass of the entire jig structure is often certain, but the overall mass is different for different terminals. During the jig testing process, the falling or tumbling action is greatly affected by the overall mass. Therefore, in order to make the overall mass of the jig during the test close to the preset terminal mass, so as to make the test results more accurate, it is considered to set the mass of the entire jig to be adjustable. Specifically, a counterweight groove is provided, and a counterweight block can be arranged in the counterweight groove, and there can be multiple counterweight blocks, and multiple specifications, similar to the role of the weights on a balance, the counterweight block can be optionally installed in the counterweight groove, and then the mass of the overall jig can be adjusted.

[0019] In the eleventh possible implementation, a locking structure is further included between the upper jig and the lower jig, and the locking structure is used to fix the relative position of the upper jig and the lower jig when the upper jig and the lower jig are in a folded state. When the lens module is assembled into the jig, the upper jig and the lower jig are folded, and the test can be performed at this time. In order to fix the relative position of the upper jig and the lower jig when they are folded, and to avoid the problem of the upper jig and the lower jig opening and the lens module falling out during the test, a locking structure is set between the upper jig and the lower jig.

[0020] In a twelfth possible implementation manner, the locking structure is a snap-fit ​​structure.

[0021] In the thirteenth possible implementation, through holes are provided on the upper fixture and the lower fixture, and the locking structure is a fastener disposed in the through hole. The locking structure is a fastener, which is easier to implement than the buckle structure, and has a higher degree of fixation reliability, and the reliability of fixation will not be affected by falling.

[0022] In a fourteenth possible implementation, the fastener includes a screw and a nut, and an elastic gasket is provided at the position where the screw and the nut are connected to the fixture, and the elastic gasket can make the connection of the fastener tighter and more reliable.

[0023] In a fifteenth possible implementation, the through holes on the upper and lower jigs are stepped holes, and both ends of the fasteners are submerged in the stepped holes. To prevent the two ends of the fasteners from affecting the movement of the test tumbling, the two ends of the fasteners are at the stepped holes and do not exceed the outer edges of the upper and lower jigs, that is, submerged in the stepped holes.

[0024] In a sixteenth possible implementation manner, a positioning structure is further included between the upper jig and the lower jig, and the positioning structure is used to guide the upper jig and the lower jig to align when the upper jig and the lower jig are folded.

[0025] In a seventeenth possible implementation, the positioning structure includes a positioning column disposed on the upper jig and a positioning groove disposed on the lower jig, and when the upper jig and the lower jig are folded, the positioning column extends into the positioning groove accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 One of the structural schematic diagrams of the folding terminal lens module fixture provided in the embodiment of the present application;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of a foldable terminal lens module fixture provided in an embodiment of the present application;

[0028] Figure 3 The second structural diagram of the foldable terminal lens module fixture provided in the embodiment of the present application;

[0029] Figure 4 The third structural diagram of the foldable terminal lens module fixture provided in the embodiment of the present application;

[0030] Figure 5 A side view of a foldable terminal lens module fixture provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 1-upper fixture; 11-upper mounting groove; 2-lower fixture; 21-lower mounting groove; 3-rotating mechanism; 31-rotating shaft; 4-lens module mounting cavity; 5-lens module; 51-lens barrel; 52-lens; 6-adhesive; 7-flexible buffer layer; 8-counterweight groove; 81-counterweight block; 9-positioning structure; 91-positioning column; 92-positioning groove. DETAILED DESCRIPTION

[0033] Terminal devices have more and more functions and forms. For example, mobile phone terminals used for communication have foldable forms. However, the lens module test fixtures for terminal devices are currently only designed and tested for individual components or for the state of non-foldable terminals. There is no lens module fixture specifically for foldable terminals.

[0034] The present application embodiment provides a foldable terminal lens module fixture, such as Figure 1 and Figure 2 As shown, it includes: an upper jig 1, on which an upper mounting groove 11 is provided; a lower jig 2, on which a lower mounting groove 21 is provided; a rotating mechanism 3, through which the upper jig 1 and the lower jig 2 are foldably connected; when the upper jig 1 and the lower jig 2 are in a folded state, the upper mounting groove 11 and the lower mounting groove 21 are aligned and buckled, and the openings are opposite, and the upper mounting groove 11 and the lower mounting groove 21 form a lens module mounting cavity 4.

[0035] The folding terminal lens module fixture of the embodiment of the present application is as follows Figure 1 and Figure 2 As shown, since the upper jig 1 and the lower jig 2 are foldably connected via the rotating mechanism 3, and the lens module mounting cavity 4 formed when the upper jig 1 and the lower jig 2 are in a folded state can accommodate the lens module 5, it is possible to simulate the installation and use environment of the folding terminal, and then relevant tests can be performed on the lens module 5 of the folding terminal.

[0036] In order to simulate the form of a foldable terminal, a rotating mechanism 3 is provided, and the rotating mechanism 3 can be implemented in a variety of ways, for example, the rotating mechanism 3 can be a flexible connector or a rotating shaft 31. Among them, the flexible connector needs to be made of a flexible material, and the material strength itself is low, while in the solution of the rotating shaft 31, the strength of the rotating shaft 31 can be well guaranteed, and it is easy to manufacture and has a low cost.

[0037] Therefore, if Figure 1 , Figure 3 and Figure 4 As shown, the rotating mechanism 3 is a rotating shaft 31 , and one side of the upper fixture 1 and one side of the lower fixture 2 are hingedly connected through the rotating shaft 31 .

[0038] It should be noted that, in the folding terminal lens module fixture of the embodiment of the present application, the configuration and position of the rotating shaft 31 can be set according to actual needs, so as to simulate the folding form of the folding terminal. Figure 1 and Figure 3 In the left-right folding mode, the rotating shaft 31 is arranged on the long sides of the upper fixture 1 and the lower fixture 2. Figure 4 In the manner of folding up and down, the rotating shaft 31 is arranged on the short sides of the upper fixture 1 and the lower fixture 2; in addition, the positions of the upper mounting groove 11 and the lower mounting groove 21 can also be set according to actual needs, based on the position where the lens module 5 is installed in the folding terminal, as shown in the figure. Figure 3 The arrangement shown near the middle of the fixture can also be as shown Figure 1 and Figure 4 Shown is set up close to the edge of the fixture.

[0039] When the lens module 5 is installed in the lens module installation cavity 4 and tested, the lens module 5 may shake due to the existence of the installation gap, thereby affecting the final test result. Figure 2 As shown, the lens module installation cavity 4 is provided with an adhesive 6, and the adhesive 6 is used to bond and fix the lens module 5 located in the lens module installation cavity 4. The lens module installation cavity 4 is provided with an adhesive 6, and the lens module 5 located in the lens module installation cavity 4 can be bonded and fixed to avoid the problem that the lens module 5 shakes during the test and affects the test result.

[0040] In addition, it should be noted that, since the lens module 5 is to be taken out from the lens module installation cavity 4 after the test is completed and may be installed in the final terminal product, the adhesive 6 is used for temporary bonding and fixing.

[0041] The adhesive member 6 may be a double-sided adhesive layer disposed in the lens module mounting cavity 4 .

[0042] For different lens modules 5, the shapes and structures of the lens barrel 51 and the lens 52 may be different. In order to avoid the adhesive 6 being bonded to the lens 52 and affecting the optical performance of the lens 52, the adhesive 6 should be bonded to the lens barrel 51. Figure 2 As shown, the lens module 5 includes a lens barrel 51 and a lens 52 arranged in the lens barrel 51 , and the adhesive member 6 is used to bond and fix the lens barrel 51 to the inner wall of the lens module installation cavity 4 .

[0043] There is an installation gap between the inner wall of the lens module installation cavity 4 and the lens module 5 located in the lens module installation cavity 4. In order to eliminate the gap and further prevent the lens module 5 from shaking in the lens module installation cavity 4, a flexible buffer layer 7 is provided. The flexible buffer layer 7 can be a foam layer. Figure 2 As shown, a flexible buffer layer 7 is provided between the inner wall of the lens module installation cavity 4 and the lens module 5 located in the lens module installation cavity 4 .

[0044] During the use of the terminal, the heating of the electronic components will cause the whole device to heat up, so the lens module 5 may work in a heated environment. In this way, in order to test the reliability of the lens module 5 in the heated environment of the terminal, a heating module is also provided, which can heat the lens module installation cavity 4, so that the lens module 5 can be in the heated environment during the use of the terminal, and then the reliability of the lens module 5 can be more comprehensively tested.

[0045] The lens module 5 of the terminal includes an ordinary lens module and a liquid lens module, wherein the structure of the ordinary lens module is solid, and after the drop or tumble test, there is generally no visual abnormality in the appearance. Therefore, for the test of the ordinary lens module, the commonly used method is: before loading into the fixture, the optical performance index of the ordinary lens module is measured and recorded, then the ordinary lens module is loaded into the fixture, and the drop or tumble test is performed, and finally, the ordinary lens module is taken out, and the optical performance index is measured again, and compared with the previous measurement results to see whether it is within the effective range of variation, and then determine whether it meets the standard. The structure of the liquid lens module is liquid, and after the drop or tumble test, whether it is intact can be directly visually observed from the appearance to see whether bubbles are generated. Therefore, in order to facilitate the test of the liquid lens module, it is necessary to set a structure that can directly observe the situation in the lens module installation cavity 4.

[0046] In some embodiments, observation partitions made of transparent material can be set at the position of the upper fixture 1 corresponding to the upper mounting groove 11, and at the position of the lower fixture 2 corresponding to the lower mounting groove 21, so that it is possible to directly observe from the outside of the fixture whether the liquid lens module is intact after testing without opening the fixture.

[0047] In some embodiments, the upper jig 1 and the lower jig 2 are both made of transparent materials. In order to facilitate observation of the situation in the lens module installation cavity 4, a transparent observation partition can be provided at the position of the upper jig 1 corresponding to the upper installation groove 11, and at the position of the lower jig 2 corresponding to the lower installation groove 21. Similarly, the upper jig 1 and the lower jig 2 can be directly made of transparent materials, which can also facilitate observation of the situation in the lens module installation cavity 4.

[0048] It should be noted that the transparent material includes glass or plastic. The transparent material here can be made into an observation partition, or can be made into the upper fixture 1 and the lower fixture 2.

[0049] The quality of the entire fixture structure is often determined, but the overall quality varies for different terminals. During the fixture test, the falling or tumbling action is greatly affected by the overall quality. Therefore, in order to make the overall quality of the fixture during the test close to the preset terminal quality and make the test results more accurate, consider setting the overall quality of the fixture to be adjustable. Specifically, Figure 1 As shown, when the upper fixture 1 and the lower fixture 2 are in the folded state, a counterweight groove 8 is formed in the upper fixture 1 and the lower fixture 2, and a counterweight block 81 is arranged in the counterweight groove 8. The counterweight block 81 is used to adjust the overall mass of the upper fixture 1 and the lower fixture 2 after folding. A counterweight groove 8 is provided, and a counterweight block 81 can be arranged in the counterweight groove 8. There can be multiple counterweight blocks 81, and multiple specifications, similar to the role of the weights of a balance. The counterweight block 81 can be optionally installed in the counterweight groove 8, and the mass of the overall fixture can be adjusted.

[0050] It should be noted that the counterweight groove 8 can be half on the upper fixture 1 and half on the lower fixture 2, similar to the upper mounting groove 11 and the lower mounting groove 12, and the counterweight groove 8 is formed after the upper fixture 1 and the lower fixture 2 are folded; it can also be separately set on the upper fixture 1 or the lower fixture 2, for example, Figure 1 As shown, the counterweight groove 8 is formed on the lower fixture 2 .

[0051] When the lens module 5 is loaded into the jig, the upper jig 1 and the lower jig 2 are folded, and the test can be performed at this time. In order to fix the relative position of the upper jig 1 and the lower jig 2 when they are folded, and to avoid the problem that the upper jig 1 and the lower jig 2 are opened and the lens module 5 falls out during the test, a locking structure is set between the upper jig 1 and the lower jig 2. The locking structure can be used to fix the relative position of the upper jig and the lower jig when the upper jig 1 and the lower jig 2 are in the folded state.

[0052] The locking mechanism can be implemented in a variety of ways, such as a snap-fit ​​structure or a fastener connection structure.

[0053] The locking structure is a fastener, which is easier to implement than the buckle structure, and has a higher degree of fixation reliability, and will not be affected by falling. Taking the fastener method as an example, the fastener includes a screw and a nut, and an elastic gasket is provided at the position where the screw and nut are connected to the fixture, and the elastic gasket can make the connection of the fastener tighter and more reliable.

[0054] In some embodiments, the through holes on the upper jig 1 and the lower jig 2 are stepped holes, and the two ends of the fastener are submerged in the stepped holes. To prevent the two ends of the fastener from affecting the movement of the test tumbling, the two ends of the fastener are at the stepped holes and do not exceed the outer edges of the upper jig and the lower jig, that is, they are submerged in the stepped holes. For example, the two ends of the fastener are retracted from the jig surface by more than or equal to 0.3 mm.

[0055] In order to facilitate the alignment of the upper fixture 1 and the lower fixture 2 when folding, Figure 1 and Figure 5 As shown, it also includes a positioning structure 9 arranged between the upper jig 1 and the lower jig 2, and the positioning structure 9 is used to guide the upper jig 1 and the lower jig 2 to align when the upper jig 1 and the lower jig 2 are folded.

[0056] Specific as Figure 5 As shown, the positioning structure 9 includes a positioning column 91 arranged on the upper jig, and a positioning groove 92 arranged on the lower jig 2. When the upper jig 1 and the lower jig 2 are folded, the positioning column 91 extends into the positioning groove 92 accordingly.

[0057] It should be noted that the positioning structure 9 may also include a column arranged on the lower jig 2 and a groove arranged on the upper jig 1 , and when the upper jig 1 and the lower jig 2 are folded, the column extends into the groove accordingly.

[0058] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A folding terminal lens module fixture, characterized in that: include: An upper fixture, wherein an upper mounting groove is provided on the upper fixture; A lower fixture, wherein the lower fixture is provided with a lower mounting groove; A rotating mechanism, through which the upper jig and the lower jig are foldably connected; When the upper fixture and the lower fixture are in a folded state, the upper mounting groove and the lower mounting groove are aligned and buckled, and the openings are opposite to each other, and the upper mounting groove and the lower mounting groove form a lens module mounting cavity.

2. The folding terminal lens module fixture according to claim 1, characterized in that: The rotating mechanism is a rotating shaft, and one side edge of the upper fixture and one side edge of the lower fixture are hinged through the rotating shaft.

3. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: The lens module installation cavity is provided with an adhesive component, and the adhesive component is used to adhere and fix the lens module located in the lens module installation cavity.

4. The folding terminal lens module fixture according to claim 3, characterized in that: The adhesive component is a double-sided adhesive layer arranged in the lens module installation cavity.

5. The folding terminal lens module fixture according to claim 3, characterized in that: The lens module comprises a lens barrel and a lens arranged in the lens barrel, and the adhesive member is used to bond and fix the lens barrel to the inner wall of the lens module installation cavity.

6. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: A flexible buffer layer is provided between the inner wall of the lens module installation cavity and the lens module located in the lens module installation cavity.

7. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: It also includes a heating module, which is used to heat the lens module installation cavity.

8. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: An observation partition made of a transparent material is provided at a position of the upper fixture corresponding to the upper mounting groove, and at a position of the lower fixture corresponding to the lower mounting groove.

9. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: The upper jig and the lower jig are both made of transparent material.

10. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: When the upper jig and the lower jig are in a folded state, a counterweight groove is formed in the upper jig and the lower jig, and a counterweight block is arranged in the counterweight groove. The counterweight block is used to adjust the overall mass of the upper jig and the lower jig after folding.

11. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: It also includes a locking structure arranged between the upper jig and the lower jig, and the locking structure is used to fix the relative position of the upper jig and the lower jig when the upper jig and the lower jig are in a folded state.

12. The folding terminal lens module fixture according to claim 11, characterized in that: The locking structure is a buckle structure.

13. The folding terminal lens module fixture according to claim 11, characterized in that: Through holes are provided in the upper jig and the lower jig, and the locking structure is a fastener arranged in the through holes.

14. The folding terminal lens module fixture according to claim 1 or 2, characterized in that: It also includes a positioning structure arranged between the upper jig and the lower jig, and the positioning structure is used to guide the upper jig and the lower jig to align when the upper jig and the lower jig are folded.

15. The folding terminal lens module fixture according to claim 14, characterized in that: The positioning structure includes a positioning column arranged on the upper jig and a positioning groove arranged on the lower jig. When the upper jig and the lower jig are folded, the positioning column extends into the positioning groove accordingly.

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