Film coating jig

Abstract

The utility model provides a coating jig. The coating jig comprises a base component and a coating auxiliary component, the base part is provided with a first through hole, and the coating auxiliary part is provided with a second through hole. The coating auxiliary part is detachably connected with the bottom end of the base part, and the second through hole is located in the first through hole. The top face of the base component makes contact with the side, needing to be coated, of a coated product, and the second through hole is aligned with the coating position of the coated product. Due to the fact that the coating auxiliary component is detachably connected with the base component, the coating auxiliary component with the second through hole of the corresponding size can be replaced and used according to different grating waveguides, the same coating jig can conduct coating operation on grating areas of different grating waveguides, the universality of the coating jig is improved, and the manufacturing cost of the coating jig is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of film coating, and in particular relates to a film coating fixture. Background Art

[0002] With the advent of the Internet+ and big data 5G era, the popularization of the metaverse concept, wearable devices, smart homes, education and teaching and other fields have developed rapidly, bringing development opportunities for augmented reality (AR) technology.

[0003] AR products are regarded as the next epoch-making terminal devices after smartphones. Head-mounted, handheld, and spatial display are the three main types of AR products. Among them, AR glasses have attracted much attention due to their lightweight and convenient features. Optical waveguides are considered to be the must-have optical solution for consumer-grade AR glasses because of their lightness and high penetration of external light. Optical waveguides can generally be divided into two types: geometric waveguides and diffractive waveguides. Geometric waveguides are so-called array waveguides, which achieve image output and eye box expansion by stacking array reflectors. Diffractive waveguides are mainly grating waveguides manufactured using photolithography technology.

[0004] In order to improve the reflection and transmission properties of the grating waveguide, it is necessary to perform a coating operation on the grating area on the waveguide substrate.

[0005] The coating operation of the existing grating waveguide is generally: align the grating area on one side of the grating waveguide with the corresponding coating hole on the coating jig, then fix the coating jig on the coating equipment, and the coating equipment performs the coating operation on the grating area on the side of the grating waveguide through the coating holes on the coating jig.

[0006] Since the grating area sizes of different grating waveguide designs may be different, it is currently necessary to design a coating jig with coating holes of corresponding sizes for the grating areas on different grating waveguides, which makes the coating jig non-universal and increases the manufacturing cost of the coating jig. Utility Model Content

[0007] In order to overcome the defects of the prior art, the utility model provides a coating fixture.

[0008] The utility model is realized by the following technical solutions:

[0009] The utility model provides a coating jig, comprising a base component and a coating auxiliary component;

[0010] The base component is provided with a first through hole;

[0011] A second through hole is provided on the coating auxiliary component;

[0012] The coating auxiliary component is detachably connected to the bottom end of the base component; the second through hole is located inside the first through hole;

[0013] The top surface of the base component contacts a side of the coated product that needs to be coated, and the second through hole is aligned with a coating position of the coated product.

[0014] Further, the base component includes a base and a cover plate;

[0015] The top surface of the base is in contact with the side of the coated product that needs to be coated;

[0016] A third through hole is formed on the top surface of the base;

[0017] The cover plate is arranged in the third through hole;

[0018] The top surface height of the cover plate is lower than the top surface height of the third through hole, and the bottom surface of the cover plate is detachably connected to the coating auxiliary component;

[0019] The first through hole is defined in the cover plate.

[0020] Furthermore, the base includes a supporting base and a transfer base;

[0021] The top surface of the support base contacts the bottom surface of the adapter base;

[0022] The third through hole is formed on the top surface of the adapter base.

[0023] Furthermore, the inner wall of the third through hole is provided with a first supporting protrusion and a second supporting protrusion in sequence from top to bottom;

[0024] The first supporting protrusion and the second supporting protrusion extend along the center direction of the through hole, and the extension length of the second supporting protrusion is greater than the extension length of the first supporting protrusion;

[0025] The bottom end of the first supporting protrusion is in contact with the top end of the second supporting protrusion;

[0026] The top surface height of the first supporting protrusion is lower than the top surface height of the third through hole;

[0027] The bottom edge of the cover plate contacts the top surface of the second supporting protrusion, and the side edge height of the cover plate is consistent with the vertical height of the first supporting protrusion;

[0028] The top surface of the first supporting protrusion contacts the side of the coated product that needs to be coated.

[0029] Furthermore,

[0030] The cover plate is a circular cover plate;

[0031] The first supporting protrusion is an annular supporting protrusion;

[0032] The second supporting protrusion is an annular supporting protrusion.

[0033] Furthermore, a receiving groove is provided on the top surface of the support base.

[0034] Furthermore, a positioning block is provided on the bottom surface of the accommodating groove.

[0035] Furthermore, a scale line is provided on the edge of the top surface of the third through hole.

[0036] Furthermore, the top edge of the third through hole extends outward to form a pick-up and placement groove, and the pick-up and placement groove is used to pick up and place the coated product on the coating fixture.

[0037] Furthermore, the coating auxiliary component adopts a coating auxiliary plate;

[0038] The coating auxiliary plate is provided with the second through hole;

[0039] The bottom surface of the cover plate is provided with a clamping groove around the first through hole;

[0040] The side surface of the coating auxiliary plate is clamped in the clamping groove.

[0041] Furthermore, under the action of external force, the side surface of the coating auxiliary plate can slide in the clamping groove.

[0042] Further, the coating auxiliary component includes a fixing plate and a coating auxiliary plate;

[0043] The coating auxiliary plate is arranged on the inner side of the fixing plate;

[0044] The fixing plate is provided with a fourth through hole;

[0045] The coating auxiliary plate is provided with the second through hole;

[0046] The second through hole is located inside the fourth through hole;

[0047] The inner side of the fixing plate is detachably connected to the bottom surface of the cover plate.

[0048] Furthermore,

[0049] A clamping protrusion is arranged on the inner side of the fixing plate around the fourth through hole;

[0050] The side surface of the coating auxiliary plate is clamped in the clamping protrusion.

[0051] Furthermore, under the action of external force, the side surface of the coating auxiliary plate can slide in the clamping protrusion.

[0052] Furthermore, a clamping groove is provided on the bottom surface of the cover plate around the first through hole;

[0053] The clamping protrusion is arranged in the clamping groove;

[0054] A first connection hole is provided on the inner side of the fixing plate, and a second connection hole is provided on the bottom surface of the cover plate;

[0055] The detachable connection between the fixing plate and the bottom surface of the cover plate is achieved through the first connecting hole and the second connecting hole.

[0056] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0057] The utility model provides a coating jig, including a base component and a coating auxiliary component. A first through hole is provided on the base component, and a second through hole is provided on the coating auxiliary component. The coating auxiliary component is detachably connected to the bottom end of the base component, and the second through hole is located inside the first through hole. The top surface of the base component contacts the side of the coating product required for coating, and the second through hole is aligned with the coating position of the coating product. Since the coating auxiliary component is detachably connected to the base component, the coating auxiliary component with the second through hole of the corresponding size can be replaced for different grating waveguides, so that the same coating jig can be used to perform coating operations on grating areas of different grating waveguides, thereby improving the versatility of the coating jig and reducing the manufacturing cost of the coating jig. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Figure 1 It is a schematic diagram of the top surface of the coating fixture of the utility model;

[0060] Figure 2 It is a bottom schematic diagram of the coating fixture of the utility model;

[0061] Figure 3 A schematic diagram of the three-dimensional structure of the support base;

[0062] Figure 4 It is a schematic diagram of the three-dimensional structure of the adapter base;

[0063] Figure 5 is a schematic diagram of the three-dimensional structure of the cover plate in the first position;

[0064] Figure 6 is a schematic diagram of the three-dimensional structure of the cover plate in the second orientation;

[0065] Figure 7 It is a schematic diagram of the three-dimensional structure of the coating auxiliary plate in the first position;

[0066] Figure 8 It is a schematic diagram of the third perspective structure of the coating auxiliary plate;

[0067] Fig. 9 is a schematic diagram of the three-dimensional structure of the fixing plate in the first position;

[0068] Fig.10 is a schematic diagram of the three-dimensional structure of the fixing plate in the second orientation;

[0069] Fig.11 It is a schematic diagram of the assembly structure of the fixing plate and the coating auxiliary plate;

[0070] Fig.12 It is a schematic diagram of the assembly structure of the fixed plate, the coating auxiliary plate and the cover plate.

[0071] Among them, 1-base component, 1-1-support base, 1-2-adapter base, 1-3-cover plate, 2-coating auxiliary component, 2-1-coating auxiliary plate, 2-2-fixing plate, 3-first through hole, 4-second through hole, 5-third through hole, 6-first supporting protrusion, 7-second supporting protrusion, 8-accommodating groove, 9-positioning block, 10-taking and placing groove, 11-clamping groove, 12-fourth through hole, 13-clamping protrusion, 14-first connecting hole, 15-second connecting hole. DETAILED DESCRIPTION

[0072] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0073] In this article, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are only used to distinguish different elements. In this article, the terms "one", "an" and other similar words are not intended to indicate that there is only one of the things described, but rather indicate that the relevant description is only for one of the things described, and the things described may have one or more. In this article, the terms "comprise", "include" and other similar words are intended to indicate logical mutual relationships, and cannot be regarded as indicating spatial structural relationships. For example, "A includes B" is intended to indicate that B belongs to A logically, but does not indicate that B is located inside A spatially. In addition, the meanings of the terms "comprise", "include" and other similar words should be regarded as open, rather than closed. For example, "A includes B" is intended to indicate that B belongs to A, but B does not necessarily constitute the whole of A, and A may also include other elements such as C, D, and E.

[0074] In this document, the terms "embodiment", "present embodiment", "preferred embodiment" and "one embodiment" do not mean that the relevant description is only applicable to a specific embodiment, but rather that the description may also be applicable to one or more other embodiments. Those skilled in the art should understand that in this document, any description of a certain embodiment can be replaced, combined, or combined in other ways with the relevant description in one or more other embodiments, and the new embodiment generated by the replacement, combination, or combination in other ways is easily conceivable by those skilled in the art and belongs to the protection scope of the present utility model.

[0075] In the description herein, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0076] The utility model provides a coating fixture, such as Figure 1 as well as Figure 2 As shown, it includes a base component 1 and a coating auxiliary component 2.

[0077] A first through hole is formed on the base component 1 , and a second through hole 4 is formed on the coating auxiliary component 2 .

[0078] The coating auxiliary component 2 is detachably connected to the bottom end of the base component 1 .

[0079] The size of the second through hole 4 is smaller than that of the first through hole, and the second through hole 4 is arranged inside the first through hole.

[0080] The top surface of the base component contacts the side of the coated product to be coated, and the second through hole 4 is aligned with the coating position of the coated product. The coating material molecules generated by the coating equipment pass through the second through hole 4 to coat the coating position of the coated product.

[0081] There is no specific limitation on the shapes of the first through hole and the second through hole, and those skilled in the art can set them according to actual needs. For example, the shape of the first through hole is rectangular, and the shape of the second through hole is circular.

[0082] Exemplarily, the coated product here may be a grating waveguide, and the coating position of the coated product may be a grating setting region (such as a coupling-in grating region) of the grating waveguide.

[0083] Since the coating auxiliary component is detachably connected to the base component, the coating auxiliary component with the second through hole of the corresponding size can be used for the coating position size of different coating products. Taking the coating product as an example of a grating waveguide, the coating auxiliary component with the second through hole of the corresponding size can be replaced for different grating waveguides, so that the same coating jig can be used for coating the grating area of ​​different grating waveguides, thereby improving the versatility of the coating jig and reducing the manufacturing cost of the coating jig.

[0084] As a preferred embodiment, the aperture size of the second through hole of the coating auxiliary component gradually decreases along the extension direction close to the coating position of the coating product, so that the coating area after the coating material molecules pass through the second through hole can be controlled, ensuring that the coating material molecules are subjected to coating operation in the coating area of ​​the coating product. In addition, the second through hole of the coating auxiliary component extends outwardly by a certain thickness close to the coating position of the coating product, so as to ensure that when the coating position of the coating product is aligned with the second through hole, the second through hole of the coating auxiliary component is as close as possible to the coating position of the coating product, further controlling the coating area after the coating material molecules pass through the second through hole, ensuring that the coating material molecules are subjected to coating operation in the coating area of ​​the coating product.

[0085] Illustratively, the base component may include a base and a cover plate 1 - 3 .

[0086] The top surface of the base contacts the side of the coated product to be coated, the top surface of the base is provided with a third through hole, a cover plate 1-3 is arranged in the third through hole, and the cover plate 1-3 is provided with the above-mentioned first through hole 3 (such as Figure 5 as well as Figure 6 shown).

[0087] Exemplarily, the base includes a supporting base 1-1 and an adapting base 1-2. The top surface of the supporting base 1-1 contacts the bottom surface of the adapting base 1-2.

[0088] The top surface of the adapter base 1-2 is provided with a third through hole 5 (such as Figure 4 The inner wall of the third through hole 5 is provided with a first supporting protrusion 6 and a second supporting protrusion 7 in sequence from top to bottom.

[0089] The first supporting protrusion 6 and the second supporting protrusion 7 extend along the center direction of the through hole, and the extension length of the second supporting protrusion 7 is greater than the extension length of the first supporting protrusion 6 .

[0090] The bottom end of the first supporting protrusion 6 is in contact with the top end of the second supporting protrusion 7 .

[0091] The top surface height of the first supporting protrusion 6 is lower than the top surface height of the third through hole 3 .

[0092] The bottom edge of the cover plate contacts the top surface of the second supporting protrusion 7 , and the side edge height of the cover plate is consistent with the vertical height of the first supporting protrusion 6 .

[0093] The top surface of the first supporting protrusion 6 is in contact with the side of the coated product that needs to be coated.

[0094] As a preferred embodiment, a receiving groove 8 (such as Figure 3 As shown), the accommodating groove 8 is used to place the coating auxiliary component arranged on the bottom surface of the cover plate to prevent the coating auxiliary component from lifting the cover plate when the bottom end of the coating auxiliary component is assembled with the base, thereby affecting the coating operation of the coating product.

[0095] As a preferred embodiment, the cover plate can be designed as a circular cover plate, the first supporting protrusion is an annular supporting protrusion, and the second supporting protrusion is an annular supporting protrusion. Thus, the relative position of the adapter base and the cover plate can be adjusted by rotating the adapter base, thereby facilitating the overlap positioning operation of the coating position of the auxiliary coating product and the second through hole. Further preferably, in order to prevent the cover plate from rotating during the rotation of the adapter base, a positioning block 9 (such as Figure 3 As shown in the figure, the height of the positioning block 9 is higher than the height of the coating auxiliary component arranged on the bottom surface of the cover plate, so that the rotation of the cover plate is blocked by the positioning block. There is no specific requirement for the shape of the positioning block, and those skilled in the art can design it according to actual needs.

[0096] As a preferred embodiment, a scale line can be set on the top edge of the third through hole. When the top edge of the third through hole matches the edge contour of the coated product and the coating position area on the coated product is determined, the scale line on the top edge of the third through hole can be used to quickly and accurately realize the overlap positioning operation of the coating position of the coated product and the second through hole.

[0097] In order to facilitate the placement of the coated product on the coating fixture, a placement groove 10 (such as Figure 4As shown in FIG. 1 , the bottom height of the pick-and-place groove 10 is lower than the top height of the third through hole, and the pick-and-place groove is used to pick up and place the coated product on the coating fixture. The number of the pick-and-place grooves may be not only one, but also multiple. There is no specific requirement for the shape of the pick-and-place groove, and those skilled in the art may design it according to actual needs.

[0098] The coating auxiliary component is detachably connected to the bottom surface of the cover plate.

[0099] Exemplarily, the coating auxiliary component adopts a coating auxiliary plate 2-1 (such as Figure 7 as well as Figure 8 As shown), a second through hole 4 is opened on the coating auxiliary plate 2-1.

[0100] The bottom surface of the cover plate 1-3 is provided with a snap-in groove 11 (such as Figure 5 As shown in FIG. 1 , the side surface of the coating auxiliary plate is clamped in the clamping groove.

[0101] Under the action of external force, the side surface of the coating auxiliary plate can slide in the clamping groove.

[0102] The coating auxiliary plate is arranged to be able to slide in the snap-in groove on the bottom surface of the cover plate, so that the relative position of the second through hole on the coating auxiliary plate to the first through hole in the cover plate can be adjusted, and the coating position of the auxiliary coating product and the coincidence positioning of the second through hole can be performed without cutting the size of the coated product.

[0103] Exemplarily, the coating auxiliary component may include a fixing plate 2-2 (such as Fig. 9 as well as Fig.10 As shown) and the coating auxiliary plate 2-1 (as shown Figure 7 as well as Figure 8 shown).

[0104] The fixing plate is provided with a fourth through hole, the coating auxiliary plate is provided with a second through hole, the coating auxiliary plate is arranged on the inner side of the fixing plate, and the second through hole is located inside the fourth through hole. Fig. 9 As shown), the side of the coating auxiliary plate 2-1 is clamped in the clamping protrusion 13, and the second through hole 4 of the coating auxiliary plate 2-1 is located in the fourth through hole 12 (as shown Fig.11 As shown), under the action of external force, the side of the coating auxiliary plate can slide in the clamping protrusion.

[0105] The inner side of the fixing plate is detachably connected to the bottom surface of the cover plate. For example, taking the example of the fixing plate inner side being provided with a snap-fitting protrusion around the fourth through hole, the bottom surface of the cover plate 1-3 is provided with a snap-fitting groove 11 around the first through hole, and the snap-fitting protrusion is provided in the snap-fitting groove; the inner side of the fixing plate 2-2 is provided with a first connecting hole 14 (such as Fig. 9 as well as Fig.10As shown), the bottom surface of the cover plate 1-3 is provided with a second connection hole 15 (as shown Figure 5 The fixing plate 2-2 and the bottom surface of the cover plate 1-3 are detachably connected through the first connecting hole and the second connecting hole (as shown in FIG. Fig.12 shown).

[0106] There is no specific limitation on the shape of the fourth through hole, and it is preferably consistent with the shape of the first through hole on the cover plate.

[0107] The coating auxiliary component of this example uses the structure of the fixing plate, the coating auxiliary plate and the cover plate to adjust the relative position of the second through hole on the coating auxiliary plate to the first through hole in the cover plate, and assists the coating position of the coating product and the coincidence positioning operation of the second through hole without cutting the size of the coating product. Compared with the coating auxiliary component using a single coating auxiliary plate, the connection structure of the fixing plate and the cover plate is used to ensure that the second through hole on the coating auxiliary plate will not move after positioning.

[0108] Taking the grating waveguide as an example of the coated product, the coating operation of the coupling-in grating region of the grating waveguide using the coating fixture of the utility model is described below:

[0109] 1. According to the required coated product and the coating position of the required coated product, a coating auxiliary component is selected accordingly, so that the aperture size of the second through hole of the coating auxiliary component corresponds to the size of the coating position of the required coated product.

[0110] 2. Assemble the coating jig, make the bottom surface of the adapter base contact with the top surface of the supporting base, detachably connect the coating auxiliary component with the corresponding position of the bottom surface of the cover plate, so that the second through hole of the coating auxiliary component is located at the corresponding position in the first through hole of the cover plate (during the rotation of the adapter base, it can ensure that the coating position of the required coated product is aligned with the second through hole of the coating auxiliary component), place the cover plate with the coating auxiliary component in the third through hole of the adapter base, and the coating auxiliary component is located in the receiving groove of the supporting base.

[0111] 3. Place the coating side of the product to be coated on the transfer base of the coating fixture.

[0112] 4. Rotate the adapter base and adjust the relative position of the adapter base and the cover plate so that the coating position of the coated product is aligned with the second through hole on the coating auxiliary component.

[0113] 5. Fix the coating fixture on which the desired coating product is placed on the coating equipment, and the coating material molecules generated by the coating equipment are plated at the coating position of the desired coating product through the second through hole.

[0114] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field can still modify or replace the specific implementation methods of the present invention. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A coating fixture, characterized in that: Including base parts and coating auxiliary parts; The base component is provided with a first through hole; A second through hole is provided on the coating auxiliary component; The coating auxiliary component is detachably connected to the bottom end of the base component; the second through hole is located inside the first through hole; The top surface of the base component contacts a side of the coated product that needs to be coated, and the second through hole is aligned with a coating position of the coated product.

2. The coating fixture according to claim 1, characterized in that: The base component comprises a base and a cover plate; The top surface of the base is in contact with the side of the coated product that needs to be coated; A third through hole is formed on the top surface of the base; The cover plate is arranged in the third through hole; The top surface height of the cover plate is lower than the top surface height of the third through hole, and the bottom surface of the cover plate is detachably connected to the coating auxiliary component; The first through hole is defined in the cover plate.

3. The coating fixture according to claim 2, characterized in that: The base includes a supporting base and a transfer base; The top surface of the support base contacts the bottom surface of the adapter base; The third through hole is formed on the top surface of the adapter base.

4. The coating fixture according to claim 3, characterized in that: The inner wall of the third through hole is provided with a first supporting protrusion and a second supporting protrusion in sequence from top to bottom; The first supporting protrusion and the second supporting protrusion extend along the center direction of the through hole, and the extension length of the second supporting protrusion is greater than the extension length of the first supporting protrusion; The bottom end of the first supporting protrusion is in contact with the top end of the second supporting protrusion; The top surface height of the first supporting protrusion is lower than the top surface height of the third through hole; The bottom edge of the cover plate contacts the top surface of the second supporting protrusion, and the side edge height of the cover plate is consistent with the vertical height of the first supporting protrusion; The top surface of the first supporting protrusion contacts the side of the coated product that needs to be coated.

5. The coating jig according to claim 4, characterized in that: The cover plate is a circular cover plate; The first supporting protrusion is an annular supporting protrusion; The second supporting protrusion is an annular supporting protrusion.

6. The coating fixture according to claim 3, characterized in that: The top surface of the support base is provided with a receiving groove.

7. The coating fixture according to claim 6, characterized in that: A positioning block is arranged on the bottom surface of the accommodating groove.

8. The coating fixture according to claim 2, characterized in that: A scale line is arranged on the edge of the top surface of the third through hole.

9. The coating fixture according to claim 2, characterized in that: The top edge of the third through hole extends outward to form a pick-up and place groove, and the pick-up and place groove is used to pick up and place the coated product on the coating fixture.

10. The coating fixture according to claim 2, characterized in that: The coating auxiliary component adopts a coating auxiliary plate; The coating auxiliary plate is provided with the second through hole; The bottom surface of the cover plate is provided with a clamping groove around the first through hole; The side surface of the coating auxiliary plate is clamped in the clamping groove.

11. The coating fixture according to claim 10, characterized in that: Under the action of external force, the side surface of the coating auxiliary plate can slide in the clamping groove.

12. The coating fixture according to claim 2, characterized in that: The coating auxiliary component includes a fixing plate and a coating auxiliary plate; The coating auxiliary plate is arranged on the inner side of the fixing plate; The fixing plate is provided with a fourth through hole; The coating auxiliary plate is provided with the second through hole; The second through hole is located inside the fourth through hole; The inner side of the fixing plate is detachably connected to the bottom surface of the cover plate.

13. The coating fixture according to claim 12, characterized in that: A clamping protrusion is arranged on the inner side of the fixing plate around the fourth through hole; The side surface of the coating auxiliary plate is clamped in the clamping protrusion.

14. The coating fixture according to claim 13, characterized in that: Under the action of external force, the side surface of the coating auxiliary plate can slide in the clamping protrusion.

15. The coating fixture according to claim 13, characterized in that: The bottom surface of the cover plate is provided with a clamping groove around the first through hole; The clamping protrusion is arranged in the clamping groove; A first connection hole is provided on the inner side of the fixing plate, and a second connection hole is provided on the bottom surface of the cover plate; The detachable connection between the fixing plate and the bottom surface of the cover plate is achieved through the first connecting hole and the second connecting hole.

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