Screw cover and air conditioner using same

Abstract

The utility model provides a screw cap and an air conditioner using the same, the screw cap is matched with a structural hole defined in a machine shell of the air conditioner, and the screw cap comprises a cap body and an anti-falling part. The cover body is configured to be detachably connected in the structural hole. The anti-disengaging part is connected to the cover body and is configured to be connected with a machine shell of the air conditioner in a telescopic mode or a folding mode so that the anti-disengaging part can be in a stretching state at least under the condition that the cover body is disengaged from the structural hole. When the screw cover is installed, the anti-falling part is firstly connected to a machine shell of the air conditioner, and at the moment, the anti-falling part is in an extending state. And then the anti-falling part is compressed towards the direction of the shell or folded towards the direction of the shell, so that the cover body connected with the anti-falling part enters the structural hole of the shell, and the connection between the cover body and the structural hole is realized. Due to the fact that the cover body is connected with the anti-disengaging part and the anti-disengaging part is connected with the machine shell, when the cover body is disengaged from the structural hole, the cover body is still connected with the machine shell through the anti-disengaging part, and the screw cover is prevented from being lost.

Description

Technical Field

[0001] The utility model relates to the technical field of air treatment, in particular to a screw cover and an air conditioner using the screw cover. Background Art

[0002] In some existing air conditioners, especially in the indoor unit of cabinet air conditioners, the screw cover is connected to the casing by interference fit, that is, a structural hole is formed on the side of the casing so that the rubber screw cover is pressed into the structural hole, and the screw cover is installed in the structural hole by using the extrusion fit between the periphery of the screw cover and the hole wall of the structural hole. However, after the casing is disassembled, the screw cover will fall off the casing, and the volume of the screw cover is small, so that when the casing is assembled again, the screw cover is easy to lose, which brings a bad user experience. Utility Model Content

[0003] In view of the above problems, the utility model is proposed to provide a screw cover and an air conditioner using the same that overcome the above problems or at least partially solve the above problems, and can solve the problem that the existing screw cover is easily lost after being removed from the casing, thereby achieving the purpose of improving user experience.

[0004] Specifically, the utility model provides a screw cover, which is adapted to a structural hole defined on a casing of an air conditioner, and includes:

[0005] a cover body configured to be detachably connected to the structural hole;

[0006] The anti-detachment part is connected to the cover body and is configured to be telescopically connected or foldably connected to the housing of the air conditioner so as to enable the anti-detachment part to be in an extended state at least when the cover body is detached from the structural hole.

[0007] Optionally, the anti-detachment portion is also configured to be capable of flexibly deforming.

[0008] Optionally, the anti-detachment portion has a rod portion extending in a straight line, and the rod portion is made of rubber; and one end of the rod portion is connected to the cover body, and a first boss is formed on the other end or at a position close to the other end; wherein the first boss is exposed from the outside of the rod portion.

[0009] Optionally, a first snap-in portion is formed on the cover body, and the first snap-in portion is configured to cooperate with a second snap-in portion provided on the structural hole, at least when the cover body is in the structural hole, to promote snap-in connection between the cover body and the housing.

[0010] Optionally, the cover body comprises:

[0011] A cover shell, which defines a receiving cavity with at least one side open, and is configured to be detachably connected to the housing in the structural hole;

[0012] A connecting seat is arranged in the accommodating cavity and is integrally arranged or connected with the anti-slip portion.

[0013] Optionally, buckle grooves are defined at least on opposite sides of the connecting seat; correspondingly, a buckle platform protruding from the cavity wall of the accommodating cavity is formed in the cover shell, and the buckle platform fits in the buckle groove to facilitate the snap connection between the connecting seat and the cover shell.

[0014] Optionally, a protruding second boss is formed on the first side of the cover body, so that when the cover body is in the structural hole, the second boss abuts against the blind end of the structural hole.

[0015] Optionally, a protruding third boss is formed on the second side of the cover body, so that when the cover body is in the structural hole, the third boss is inserted into an assembly hole or groove defined on the hole wall on the corresponding side of the structural hole.

[0016] The utility model also provides an air conditioner, comprising:

[0017] The housing defines a blind hole-shaped structural hole, and defines a screw hole for passing a fastening screw at a blind end of the structural hole;

[0018] The screw cover as described in any one of the above is arranged in the structural hole and is detachably connected to the casing.

[0019] Optionally, a limiting hole is further defined at the blind end of the structural hole, and the limiting hole has a first hole segment, a neck, and a second hole segment connected in sequence, and at least the opening area of ​​the first hole segment is larger than the opening area of ​​the second hole segment, so as to facilitate the anti-slip portion of the screw cover to pass through the first hole segment of the limiting hole, radially enter the second hole segment through the neck, and cooperate with the hole edge of the second hole segment in a limiting manner.

[0020] In the screw cover of the utility model and the air conditioner using the same, when installing the screw cover, the anti-slipping part is first connected to the casing of the air conditioner, and the anti-slipping part is in an extended state. Then the anti-slipping part is compressed or folded toward the casing, so that the cover body connected to the anti-slipping part enters the structural hole of the casing, and the connection between the cover body and the structural hole is achieved. Since the cover body is connected to the anti-slipping part, and the anti-slipping part is connected to the casing, when the cover body is removed from the structural hole, the cover body is still connected to the casing through the anti-slipping part, thereby preventing the screw cover from being lost.

[0021] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0023] Figure 1 is a schematic structural diagram of a screw cover according to an embodiment of the utility model;

[0024] Figure 2 is a schematic exploded view of a screw cover according to an embodiment of the utility model;

[0025] Figure 3 is a schematic structural diagram of a screw cover and a housing according to an embodiment of the utility model;

[0026] Figure 4 is a schematic structural diagram of a screw cover and a housing according to another embodiment of the utility model;

[0027] Figure 5 is a schematic structural diagram of a screw cover and a housing according to another embodiment of the utility model;

[0028] Figure 6 yes Figure 5 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0029] Refer to the following Figures 1 to 6 To describe the screw cover of the embodiment of the utility model and the air conditioner using the same. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0030] Unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0031] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] Figure 1 is a schematic structural diagram of a screw cover according to an embodiment of the utility model, such as Figure 1 As shown, and refer to Figures 2 to 6 The embodiment of the utility model provides a screw cover, which is adapted to a structural hole defined on a housing 120 of an air conditioner, and includes a cover body 110 and an anti-detachment portion. The cover body 110 is configured to be detachably connected to the structural hole. The anti-detachment portion is connected to the cover body 110, and is configured to be telescopically connected or foldably connected to the housing 120 of the air conditioner, so that at least when the cover body 110 is detached from the structural hole, the anti-detachment portion is in an extended state.

[0034] In the screw cover of the embodiment of the utility model, when installing the screw cover, the anti-slip part is first connected to the housing 120 of the air conditioner, and the anti-slip part is in an extended state. Then the anti-slip part is compressed toward the housing 120 or folded toward the housing 120, so that the cover body 110 connected to the anti-slip part enters the structural hole of the housing 120, and the cover body 110 is connected to the structural hole. Since the cover body 110 is connected to the anti-slip part, and the anti-slip part is connected to the housing 120, when the cover body 110 is removed from the structural hole, the cover body 110 is still connected to the housing through the anti-slip part, thereby preventing the screw cover from being lost.

[0035] Furthermore, since the anti-detachment portion can compress or fold the connecting shell, that is, when the cover body 110 is installed in place, the anti-detachment portion will not be exposed outside the casing 120, making the casing 120 neat and beautiful, meeting people's aesthetic needs and enhancing market competitiveness.

[0036] In some embodiments of the present invention, the anti-detachment portion is further configured to be capable of flexibly deforming.

[0037] As can be seen from the above embodiment, the anti-slip part is connected to the housing 120, and the anti-slip part is also connected to the cover 110. In this embodiment, since the anti-slip part can be flexibly deformed, after the anti-slip part is installed in the housing 120, the position of the cover 110 can be adjusted at will, so that the cover 110 can enter the structural hole. In other words, when installing the anti-slip part, there is no need to pay attention to and adjust the position and state of the cover 110, so that the assembly process is simple and fast, and the assembly efficiency can be improved.

[0038] Furthermore, a screw is installed in the structural hole. When the screw needs to be removed, the cover 110 is first removed from the structural hole. Since the anti-detachment portion can be flexibly deformed, the anti-detachment portion can be bent to make way, so that the cover 110 is in a position that does not completely block the structural hole. In other words, the screw can be installed and removed without removing the screw cover, which shortens the assembly process of the workers and ensures assembly efficiency.

[0039] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the anti-slip portion has a rod portion 113 extending in a straight line, and the rod portion 113 is made of rubber. In addition, one end of the rod portion 113 is connected to the cover body 110, and a first boss 1131 is formed on the other end or at a position close to the other end. The first boss 1131 is exposed from the outside of the rod portion 113.

[0040] In this embodiment, during the assembly process, one end of the rod 113 provided with the first boss 1131 is connected to the housing 120. Since the rod 113 is made of rubber material, the friction of rubber is relatively large. After the assembly is completed, the friction between the anti-slip portion and the housing 120 can be increased, which is more conducive to preventing the anti-slip portion from detaching from the housing 120. In addition, since the rod 113 extends straight from the anti-slip portion, the structure is very simple. Compared with the special-shaped anti-slip portion, the rod 113 extending straight makes the installation more convenient. Due to the provision of the first boss, the rod 113 is clamped on the housing and will not fall off.

[0041] Furthermore, since the anti-slip part is made of rubber material, and the first boss 1131 leaks out from the outside of the rod part 113, only one mold is needed to complete the production of the entire anti-slip part, that is, the anti-slip part is integrally formed, which improves the production efficiency of the anti-slip part. In addition, the rubber material is cheap, which reduces the production cost of the anti-slip part.

[0042] In some embodiments of the present invention, a first snap-fit ​​portion is formed on the cover body 110, and the first snap-fit ​​portion is configured to cooperate with a second snap-fit ​​portion provided on the structural hole, at least when the cover body 110 is in the structural hole, to promote a snap-fit ​​connection between the cover body 110 and the housing 120.

[0043] In this embodiment, after the anti-detachment part is connected to the housing 120, in the process of connecting the cover body 110 to the structural hole, the cover body 110 is first assembled in the structural hole, and when the first buckle part on the cover body 110 and the second buckle part on the structural hole are buckled together, the cover body 110 is assembled in place in the structural hole, so that the cover body 110 is buckled on the housing 120. The connection between the cover body 110 and the housing 120 is realized by using the first buckle part and the second buckle part, and the structure is very simple and the operation is relatively convenient.

[0044] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the cover body 110 includes a cover shell 111 and a connection seat 112. The cover shell 111 defines a receiving cavity with at least one side open, and is configured to be detachably connected to the housing 120 in the structural hole. The connection seat 112 is arranged in the receiving cavity, and is integrally arranged or connected with the anti-detachment portion.

[0045] In this embodiment, during the process of assembling the cover body 110, the connection seat 112 is assembled in the accommodating cavity on the cover shell 111, and since the anti-detachment portion and the connection seat 112 are integrally formed or connected together, the connection between the anti-detachment portion and the cover shell 111 is achieved. The anti-detachment portion is connected to the housing 120, and then the cover body 110 is installed in the structural hole, so that the screw cover is installed. Since the cover shell 111 and the connection seat 112 can be disassembled, the cover shell 111 and the connection seat 112 can be produced separately, thereby improving production efficiency.

[0046] Furthermore, since the cover 111 and the connecting seat 112 are detachable, the cover 111 can be made into different materials and patterns, and the user can replace the cover 111 according to his or her own preferences to meet the user's personalized needs and enhance market competitiveness.

[0047] In some embodiments of the present invention, Figure 2 As shown, at least two opposite sides of the connection base 112 define buckle grooves 1121. Correspondingly, a buckle platform 1114 protruding from the cavity wall of the accommodating cavity is formed in the cover shell 111, and the buckle platform 1114 fits and buckles in the buckle grooves 1121 to promote the buckle connection between the connection base 112 and the cover shell 111.

[0048] In this embodiment, during the assembly of the cover body 110, the connection seat 112 is assembled into the accommodating cavity, and when the buckle platform 1114 in the accommodating cavity is buckled into the buckle groove 1121 of the connection seat 112, the connection seat 112 is assembled in place in the accommodating cavity, so that the connection seat 112 is connected to the housing 111. The connection structure of the buckle platform 1114 and the buckle groove 1121 is used to connect the connection seat 112 to the housing 111. The connection structure is very simple, the assembly steps are relatively few, and the assembly efficiency is guaranteed.

[0049] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, a protruding second boss 1113 is formed on the first side of the cover body 110 so that when the cover body 110 is in the structural hole, the second boss 1113 abuts against the blind end of the structural hole.

[0050] In this embodiment, the structural hole is a blind hole structure. During the assembly process, the first side of the cover 110 is installed toward the structural hole, and when the second boss 1113 on the first side of the cover 110 abuts against the blind end of the structural hole, the cover 110 is assembled in place in the structural hole. The second boss 1113 is provided so that when the cover 110 is assembled in place in the structural hole, there is a gap between the cover 110 and the blind end of the structural hole, so as to facilitate the removal of the cover 110 from the structural hole.

[0051] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, a protruding third boss 1112 is formed on the second side of the cover body 110 to facilitate the third boss 1112 to be inserted into the assembly hole 121 or groove defined on the hole wall on the corresponding side of the structural hole when the cover body 110 is in the structural hole.

[0052] In this embodiment, the second side of the cover body 110 has a third boss 1112, and the corresponding hole wall of the structural hole has an assembly hole 121 that matches the third boss 1112. During the assembly process, the cover body 110 is first installed into the structural hole. When the third boss 1112 on the cover body 110 is inserted into the assembly hole 121 on the hole wall, the cover body 110 has been assembled in place in the structural hole. The provision of the third boss 1112 and the assembly hole 121 makes the assembly process between the cover body 110 and the structural hole simple, and is firm and reliable after assembly.

[0053] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the cover 110 is provided with a disassembly opening 1111. After the cover 110 is installed in the structural hole, the disassembly opening 1111 on the cover 110 is in the same plane as the side wall of the housing 120 where the structural hole is located. In this embodiment, the disassembly opening 1111 is provided to facilitate the user to disassemble the cover 110.

[0054] In some embodiments of the utility model, the third boss 1112 is configured to be flexibly deformable. During the installation process, as the distance between the third boss 1112 and the hole wall of the structural hole becomes closer and closer, when the third boss 1112 contacts the hole wall of the structural hole, the third boss 1112 is deformed, so that the cover body 110 can continue to move into the structural hole. After the third boss 1112 enters the assembly hole 121, due to the loss of the squeezing force, the third boss 1112 returns to its original state and cooperates with the assembly hole 121 to limit the cover body 110. This can make the disassembly or installation of the cover body 110 more labor-saving.

[0055] In some other embodiments of the utility model, the third boss 1112 is telescopically disposed on the second side of the cover body 110. During the installation process, as the distance between the third boss 1112 and the hole wall of the structural hole becomes closer and closer, when the third boss 1112 contacts the hole wall of the structural hole, the third boss 1112 is compressed toward the cover body 110, so that the cover body 110 can continue to move into the structural hole. After the third boss 1112 enters the assembly hole 121, due to the loss of the squeezing force, the third boss 1112 returns to its original state and cooperates with the assembly hole 121 to limit the cover body 110.

[0056] like Figures 3 to 6As shown, the embodiment of the utility model further provides an air conditioner, comprising a housing 120 and a screw cover as in any of the above embodiments. The housing 120 defines a blind hole-shaped structural hole, and defines a screw hole 124 for passing a fastening screw at the blind end of the structural hole. The screw cover is arranged in the structural hole and is detachably connected to the housing 120.

[0057] In this embodiment, a screw is disposed in the screw hole 124 in the structural hole, and a screw cover is disposed in the structural hole to shield the screw so that the screw cannot be seen on the outer surface of the housing 120 , thereby improving the aesthetics of the housing 120 .

[0058] In some embodiments of the present invention, Figure 3 As shown, the outer surface contour of the cover body 110 is adapted to the outer surface contour of the structural hole. After the cover body 110 is assembled in the structural hole, the rear surface of the cover body 110 and the side wall of the casing 120 where the structural hole is located are on the same plane, and the gap is very small, making the outer surface of the casing 120 more beautiful.

[0059] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the structural hole has four hole walls, which are a first side hole wall and a second side hole wall arranged opposite to each other, a bottom wall which is a blind end of the structural hole, and a third side hole wall connected to the first side wall and the second side wall. The structural hole also includes an opening arranged opposite to the third side hole wall, and a limiting platform 123 is arranged at the opening. After the cover body 110 is installed in the structural hole, the limiting platform 123 abuts against the cover body 110 to fix the cover body 110. The setting of the limiting platform 123 facilitates the installation of the cover body 110 by the staff. They only need to press the cover body 110 into the structural hole, and the limiting platform 123 can move the cover body 110 to the specified position.

[0060] In some embodiments of the present invention, Figure 4 and Figure 6 As shown, a limiting hole is also defined at the blind end of the structural hole, and the limiting hole has a first hole segment 1251, a neck, and a second hole segment 1252 connected in sequence, and at least the opening area of ​​the first hole segment 1251 is larger than the opening area of ​​the second hole segment 1252, so as to facilitate the anti-slip portion of the screw cover to pass through the first hole segment 1251 of the limiting hole, enter the second hole segment 1252 radially through the neck, and cooperate with the hole edge of the second hole segment 1252. The cross-sectional area of ​​the first boss 1131 of the anti-slip portion perpendicular to its axis is smaller than the opening area of ​​the first hole segment 1251, and the cross-sectional area of ​​the first boss 1131 of the anti-slip portion perpendicular to its axis is larger than the opening area of ​​the second hole segment 1252.

[0061] In this embodiment, during the assembly process, first, one end of the anti-slip portion is inserted into the first hole section 1251 with a larger opening area, and the first boss 1131 is passed through the first hole section 1251, and then the anti-slip portion is dragged to the second hole section 1252 with a smaller opening area, so that the anti-slip portion enters the second hole section 1252, and then the connection between the anti-slip portion and the housing 120 is completed. The first hole section 1251 with a larger opening area of ​​the limiting hole facilitates the insertion of the anti-slip portion and ensures the installation efficiency of the anti-slip portion. In addition, since the cross-sectional area of ​​the first boss 1131 of the anti-slip portion perpendicular to its axis is larger than the opening area of ​​the second hole section 1252, the anti-slip portion will not slip out of the second hole section 1252, preventing the cover body 110 connected to the anti-slip portion from falling off.

[0062] Since the limiting hole is located at the blind end of the structural hole, the anti-dropout portion is located at the end of the cover 110 facing the structural hole. After the cover 110 is installed in the structural hole, the anti-dropout portion will not be exposed on the outer surface of the housing 120, ensuring the aesthetics of the housing 120.

[0063] In some embodiments of the present invention, Figure 6 As shown, one of the assembly holes 121 on the hole wall of the structural hole is connected to the first hole segment 1251. Since the first hole segment 1251 is connected to the second hole segment 1252, during the production process, it is convenient for the staff to punch the first hole segment 1251, the second hole segment 1252 and the assembly hole 121, which shortens the production time and ensures the production efficiency.

[0064] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A screw cover adapted to fit a structural hole defined on a casing of an air conditioner, characterized in that: include: a cover body configured to be detachably connected to the structural hole; The anti-detachment part is connected to the cover body and is configured to be telescopically connected or foldably connected to the housing of the air conditioner so as to enable the anti-detachment part to be in an extended state at least when the cover body is detached from the structural hole.

2. The screw cover according to claim 1, characterized in that: The anti-detachment portion is also configured to be flexibly deformable.

3. The screw cover according to claim 2, characterized in that: The anti-slip portion has a rod portion extending in a straight line, and the rod portion is made of rubber; and one end of the rod portion is connected to the cover body, and a first boss is formed on the other end or at a position close to the other end; wherein the first boss is exposed from the outside of the rod portion.

4. The screw cover according to claim 1, characterized in that: A first snap-on portion is formed on the cover body, and the first snap-on portion is configured to cooperate with a second snap-on portion provided on the structural hole, at least when the cover body is in the structural hole, so as to promote snap-on connection between the cover body and the housing.

5. The screw cover according to claim 1, characterized in that: The cover body comprises: A cover shell, which defines a receiving cavity with at least one side open, and is configured to be detachably connected to the housing in the structural hole; A connecting seat is arranged in the accommodating cavity and is integrally arranged or connected with the anti-slip portion.

6. The screw cover according to claim 5, characterized in that: At least buckle grooves are defined on two opposite sides of the connecting seat; correspondingly, a buckle platform protruding from the cavity wall of the accommodating cavity is formed in the cover shell, and the buckle platform fits in the buckle groove to promote the buckle connection between the connecting seat and the cover shell.

7. The screw cover according to claim 1, characterized in that: A protruding second boss is formed on the first side of the cover body, so that when the cover body is in the structural hole, the second boss abuts against the blind end of the structural hole.

8. The screw cover according to claim 1, characterized in that: A protruding third boss is formed on the second side of the cover body, so that when the cover body is in the structural hole, the third boss is inserted into an assembly hole or a groove defined on the hole wall at the corresponding side of the structural hole.

9. An air conditioner, characterized in that: include: The housing defines a blind hole-shaped structural hole, and defines a screw hole for passing a fastening screw at a blind end of the structural hole; The screw cover according to any one of claims 1 to 8 is arranged in the structural hole and is detachably connected to the housing.

10. The air conditioner according to claim 9, characterized in that: A limiting hole is also defined at the blind end of the structural hole, and the limiting hole has a first hole segment, a neck and a second hole segment connected in sequence, and at least the opening area of ​​the first hole segment is larger than the opening area of ​​the second hole segment, so as to enable the anti-slip portion of the screw cover to pass through the first hole segment of the limiting hole, enter the second hole segment radially through the neck, and cooperate with the hole edge of the second hole segment.

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