A fender structure and vehicle

Abstract

This application discloses a protective panel structure and a vehicle, belonging to the field of protective panel technology. The protective panel structure is used to connect with sheet metal parts. The protective panel structure includes a body and a buffer assembly. The buffer assembly includes a first buffer part and a second buffer part. The first buffer part is located on one side of the body and connected to the body. At least a portion of the second buffer part is disposed on the side of the body opposite to the first buffer part and connected to the body. The side of the second buffer part opposite to the first buffer part is used to connect with the sheet metal parts. With the first buffer part, when the tailgate structure is closed, the first buffer part will collide with the buffer structure on the tailgate structure, preventing the buffer structure from directly impacting the protective panel body, thus providing a certain buffering effect. The second buffer part is provided on the side of the protective panel body opposite to the first buffer part, which can further buffer the impact force, thereby protecting the protective panel body and preventing damage to the protective panel body caused by repeated opening and closing of the tailgate structure.

Description

Technical Field

[0001] This application relates to the field of skid plate technology, and more particularly to a skid plate structure and vehicle. Background Technology

[0002] The rear combination light guard plate on a vehicle not only protects the lights from external impacts but also enhances the overall aesthetics of the vehicle. The rear combination light guard plate is typically fixed to the light housing with screws and then mounted as a whole on the rear sheet metal of the car. When the tailgate is closed, the buffer structure on the tailgate acts directly on the guard plate. Repeated opening and closing of the tailgate over a long period can cause significant deformation of the guard plate, leading to damage. Utility Model Content

[0003] This application provides a protective panel structure to solve the problem of deformation of the protective panel caused by repeated opening and closing of the rear door.

[0004] To achieve the above objectives, according to a first aspect of this application, a protective plate structure is provided for connection with a sheet metal part, the protective plate structure comprising:

[0005] ontology;

[0006] A buffer assembly includes a first buffer portion and a second buffer portion. The first buffer portion is located on one side of the body and is connected to the body. At least a portion of the second buffer portion is disposed on the side of the body opposite to the first buffer portion and is connected to the body. The side of the second buffer portion opposite to the first buffer portion is used to connect to the sheet metal part.

[0007] Optionally, the second buffer portion includes a first body and a second body connected together. The first body is disposed on the side of the body opposite to the first buffer portion, and the second body passes through the body and is connected to the first buffer portion.

[0008] Optionally, the protective plate structure further includes:

[0009] A connector is respectively inserted through the first buffer part, the body and the second buffer part, and the connector is used to connect the first buffer part and the second buffer part to the body.

[0010] Optionally, the first buffer portion has a receiving cavity; the buffer assembly further includes:

[0011] A first gasket portion is at least partially disposed within the receiving cavity, the first gasket portion is disposed around the connector, and at least a portion of the connector is located on the side of the first gasket portion opposite to the second buffer portion.

[0012] Optionally, the buffer component further includes:

[0013] The second gasket is disposed on the side of the body away from the first buffer portion and is connected to the body and the second buffer portion respectively. The second gasket is disposed around the connector.

[0014] Optionally, the body has a placement groove on the side opposite to the first buffer portion, and the second pad portion is disposed in the placement groove.

[0015] Optionally, the buffer component further includes:

[0016] The second buffer portion is pre-connected to the main body via the pre-connection portion.

[0017] Optionally, the first buffer portion has a positioning protrusion on the side facing the second buffer portion, and the body has a positioning groove, with the positioning protrusion embedded in the positioning groove.

[0018] According to a second aspect of this application, a vehicle is provided, comprising:

[0019] Sheet metal parts;

[0020] As described in any of the above-mentioned protective plate structures, the connecting member of the protective plate structure is connected to the sheet metal part so that the first buffer portion of the protective plate structure is connected to the sheet metal part;

[0021] The rear door structure includes a door body and a third buffer section connected together. When the door body is closed, the third buffer section is used to connect with the first buffer section of the protective panel structure.

[0022] Optionally, the first buffer part has a first connecting surface on the side of the second buffer part away from the guard plate structure, and the third buffer part has a second connecting surface. Both the first connecting surface and the second connecting surface are planar. When the door is closed, the first connecting surface is connected to the second connecting surface.

[0023] The protective panel structure of this application embodiment is used to connect with sheet metal parts. The protective panel structure includes a body and a buffer assembly. The buffer assembly includes a first buffer part and a second buffer part. The first buffer part is located on one side of the body and is connected to the body. At least a portion of the second buffer part is disposed on the side of the body opposite to the first buffer part and is connected to the body. The side of the second buffer part opposite to the first buffer part is used to connect with the sheet metal parts. With the first buffer part, when the tailgate structure is closed, the first buffer part will collide with the buffer structure on the tailgate structure, avoiding the buffer structure from directly impacting the protective panel body, thus playing a certain buffering role. The second buffer part is provided on the side of the protective panel body opposite to the first buffer part, which can further buffer the impact force, thereby protecting the protective panel body and preventing damage to the protective panel body caused by repeated opening and closing of the tailgate structure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 This is an exploded structural diagram of the third buffer section, the protective plate structure, and the sheet metal parts provided in the exemplary embodiments of this disclosure.

[0027] Figure 2 This is a perspective view of the third buffer section, the protective plate structure, and the sheet metal parts provided in the exemplary embodiments of this disclosure;

[0028] Figure 3 This is a perspective view of the body provided in an exemplary embodiment of this disclosure;

[0029] Figure 4 This is a cross-sectional view of the rear door structure, the protective panel structure, and the sheet metal connection provided in an exemplary embodiment of this disclosure.

[0030] Figure 5 This is a partial cross-sectional view of the connection between the protective plate structure and the sheet metal parts provided in the exemplary embodiments of this disclosure;

[0031] Figure 6 This is a perspective view of the first buffer section provided in an exemplary embodiment of this disclosure;

[0032] Figure 7 This is a front sectional view of the first buffer section provided in an exemplary embodiment of this disclosure;

[0033] Figure 8 This is a front sectional view of the connection between the first buffer portion and the first pad portion provided in an exemplary embodiment of this disclosure.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10-Body; 11-Placement groove; 12-Positioning groove; 20-Buffer assembly; 21-First buffer part; 211-Receiving cavity; 212-First connecting surface; 22-Second buffer part; 221-First main body; 222-Second main body; 23-First gasket part; 24-Second gasket part; 25-Pre-connection part; 26-Positioning protrusion; 30-Sheet metal part; 40-Connector; 50-Rear door structure; 51-Door body; 52-Third buffer part; 521-Second connecting surface; 60-Limiting ring. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0037] The rear combination light guard plate on a vehicle not only protects the lights from external impacts but also enhances the overall aesthetics of the vehicle. The rear combination light guard plate is typically screwed to the light housing and then mounted onto the rear sheet metal of the car. When the tailgate is closed, the tailgate's buffer structure directly impacts the guard plate. The impact force generated when closing the tailgate is significant. Although the buffer structure can cushion the impact to some extent, a considerable force still acts on the guard plate. Repeated opening and closing of the tailgate over a long period can cause significant deformation of the guard plate, leading to damage and affecting its appearance.

[0038] Please see Figure 1 , Figure 2 and Figure 4 This application provides a protective plate structure for connection with sheet metal parts 30. The protective plate structure includes a body 10 and a buffer assembly 20.

[0039] The buffer assembly 20 includes a first buffer portion 21 and a second buffer portion 22. The first buffer portion 21 is located on one side of the body 10 and is connected to the body 10. At least a portion of the second buffer portion 22 is disposed on the side of the body 10 away from the first buffer portion 21 and is connected to the body 10. The side of the second buffer portion 22 away from the first buffer portion 21 is used to connect to the sheet metal part 30.

[0040] Understandably, in the vehicle, the skid plate structure is connected to the sheet metal part 30. The first buffer part 21 on the buffer assembly 20 is located on the side of the body 10 away from the sheet metal part 30. When the tailgate structure 50 is closed, the third buffer part 52 on the tailgate structure 50 will impact the skid plate structure. The third buffer part 52 is the buffer structure originally provided on the door body 51. The position of the first buffer part 21 on the skid plate structure corresponds to the position of the third buffer part 52, so that the third buffer part 52 can impact the first buffer part 21. The first buffer part 21 undergoes a certain deformation, which buffers the impact force of the third buffer part 52, preventing the third buffer part 52 from acting directly on the body 10 of the skid plate structure, thus providing a certain degree of protection for the body 10.

[0041] A second buffer portion 22 is also connected to the main body 10. A portion of the second buffer portion 22 is located on the side of the main body 10 away from the first buffer portion 21, or the second buffer portion 22 may be entirely located on the side of the main body 10 away from the first buffer portion 21. In other words, at least a portion of the second buffer portion 22 is located between the main body 10 and the sheet metal part 30. When the third buffer portion 52 impacts the first buffer portion 21, the force is transmitted to the second buffer portion 22, causing a certain degree of deformation in the second buffer portion 22, further buffering the impact of the third buffer portion 52 and providing some protection for the main body 10 and the sheet metal part 30. Therefore, the buffer assembly 20 prevents the tailgate structure 50 from directly impacting the main body 10 when closed. The buffer assembly 20 effectively buffers and dampens the impact force, reducing the risk of damage to the main body 10 during use. During repeated opening and closing of the tailgate structure 50, the main body 10 is less prone to deformation, ensuring the aesthetic appearance of the protective panel structure.

[0042] The first buffer part 21 and the second buffer part 22 can be made of rubber or polyurethane foam, etc., and both can have a porous structure inside, which is beneficial to improving the buffering effect.

[0043] Please see Figure 4 and Figure 5 In conjunction with the above embodiments, in some embodiments, the second buffer portion 22 includes a first body 221 and a second body 222 connected to each other. The first body 221 is disposed on the side of the body 10 away from the first buffer portion 21, and the second body 222 penetrates the body 10 and is connected to the first buffer portion 21.

[0044] It is understandable that when the second buffer part 22 is only partially disposed on the side of the body 10 away from the first buffer part 21, the second buffer part 22 may include a first body 221 and a second body 222, wherein the first body 221 is disposed on the side of the body 10 away from the first buffer part 21, and the second body 222 passes through the body 10 and connects to the first buffer part 21. When the rear door structure 50 is closed, the third buffer part 52 impacts the first buffer part 21, and the first buffer part 21 can transfer a portion of the force to the second body 222, and then through the second body 222 to the first body 221.

[0045] By connecting the second body 222 between the first buffer part 21 and the first body 221, the force on the first buffer part 21 can be easily transferred to the first body 221. The second body 222 itself can also directly bear part of the force from the first buffer part 21, thereby reducing the force of the first buffer part 21 on the body 10 and further reducing the risk of deformation of the body 10.

[0046] Please see Figure 4 and Figure 5 In conjunction with the above embodiments, in some embodiments, the protective plate structure further includes a connector 40, which passes through the first buffer part 21, the body 10 and the second buffer part 22 respectively, and is used to connect the first buffer part 21 and the second buffer part 22 to the body 10.

[0047] It is understood that the connector 40 on the protective plate structure can pass through the first buffer portion 21, the body 10, and the second buffer portion 22, allowing the protective plate structure to be connected to the sheet metal part 30. Through the fixing action of the connector 40, the first buffer portion 21 can be fixed to the side of the body 10 opposite to the sheet metal part 30, and at least a portion of the second buffer portion 22 can be fixed between the body 10 and the sheet metal part 30, with the second buffer portion 22 connected to both the body 10 and the sheet metal part 30. The connector 40 may include a screw and a nut. The screw passes through the first buffer portion 21, the body 10, the second buffer portion 22, and the sheet metal part 30, and the nut is then fitted onto the screw, so that the nut abuts against the side of the sheet metal part 30 opposite to the second buffer portion 22, thereby connecting the protective plate structure to the sheet metal part 30, ensuring the stability of the first buffer portion 21 and the second buffer portion 22 during use, and ensuring the stability of the connection between the body 10 and the sheet metal part 30.

[0048] A groove structure is provided inside the first buffer part 21. This groove structure can accommodate the top part of the connector 40, so that the top part of the connector 40 is located inside the groove structure and does not protrude from the first buffer part 21. When the third buffer part 52 impacts the first buffer part 21, the third buffer part 52 can contact the first buffer part 21 first, making full use of the buffering effect of the first buffer part 21 and improving the buffering effect.

[0049] Please see Figure 4 and Figure 5 In conjunction with the above embodiments, in some embodiments, the first buffer portion 21 has a receiving cavity 211. The buffer assembly 20 also includes a first pad portion 23, which is at least partially disposed within the receiving cavity 211. The first pad portion 23 is disposed around the connector 40, and at least a portion of the connector 40 is located on the side of the first pad portion 23 opposite to the second buffer portion 22.

[0050] It is understandable that, such as Figure 7 As shown, a ring-shaped receiving cavity 211 can be provided inside the first buffer section 21, and this receiving cavity 211 is arranged around the connecting member 40, such as... Figure 8 As shown, a first gasket portion 23 with an annular structure can be provided inside the receiving cavity 211. At least a portion of the first gasket portion 23 is disposed in the receiving cavity 211 and also surrounds the connector 40. By placing the first gasket portion 23 inside the first buffer portion 21, the two can be compactly arranged, reducing the space occupied and preventing the position of the first gasket portion 23 from shifting during installation or use. At the same time, placing the rigid first gasket portion 23 inside the flexible first buffer portion 21 can, on the one hand, disperse the concentrated pressure of the connector 40, prevent the first buffer portion 21 from being excessively squeezed, thus reducing its buffering performance, and prevent the connector 40 from loosening; on the other hand, the lower surface of the flexible first buffer portion 21 can be directly and tightly connected to the body 10, improving the sealing of the connection between the connector 40 and the body 10, and preventing the connection point from being corroded by liquid, which would make the connector 40 inconvenient to disassemble or damaged.

[0051] Please see Figure 5 In conjunction with the above embodiments, in some embodiments, the buffer assembly 20 further includes a second pad portion 24, which is disposed on the side of the body 10 away from the first buffer portion 21 and is connected to the body 10 and the second buffer portion 22 respectively. The second pad portion 24 is disposed around the connector 40.

[0052] It is understood that a second gasket 24 with an annular structure is also provided between the second buffer part 22 and the body 10. Specifically, the second gasket 24 is provided between the first body 221 and the body 10. The vertical projection area of ​​the second gasket 24 on the body 10 is greater than or equal to the vertical projection area of ​​the first body 221 on the body 10. The second gasket 24 can disperse the force exerted by the first body 221 on the body 10 and prevent the connector 40 from becoming loose.

[0053] Please see Figure 3 In conjunction with the above embodiments, in some embodiments, a limiting ring 60 can be provided at the bottom of the main body 10. The limiting ring 60 can be provided around the connector 40, and the limiting ring 60 and the main body 10 enclose a limiting cavity. The second gasket part 24 can be placed in the limiting cavity, which can play a certain limiting role on the second gasket part 24 and prevent the position of the second gasket part 24 from shifting during installation or use.

[0054] Please see Figure 5 In conjunction with the above embodiments, in some embodiments, the body 10 has a placement groove 11 on the side opposite to the first buffer portion 21, and the second pad portion 24 is disposed in the placement groove 11.

[0055] It is understandable that a placement groove 11 can also be provided on the main body 10, and the second pad part 24 can be placed in the placement groove 11. The placement groove 11 can play a certain limiting role for the second pad part 24, preventing its position from shifting, and can also make the protective plate structure more compact, reducing the space occupied.

[0056] Please see Figure 4 In conjunction with the above embodiments, in some embodiments, the buffer assembly 20 further includes a pre-connection portion 25, and the second buffer portion 22 is pre-connected to the body 10 through the pre-connection portion 25.

[0057] Understandably, when installing the second buffer part 22 onto the body 10, it can be pre-connected to the body 10 via the pre-connection part 25 to prevent the second buffer part 22 from detaching from the body 10 during installation, which facilitates the rapid installation of the protective plate structure and sheet metal parts 30. The pre-connection part 25 can be adhesive, double-sided tape, etc. The pre-connection part 25 only needs to ensure that the second buffer part 22 does not fall off the body 10 during installation; therefore, the thickness of the pre-connection part 25 is relatively small, and the contact area with the second buffer part 22 is also relatively small, so it will not affect the connection between the second buffer part 22 and the second gasket part 24.

[0058] Please see Figure 5 and Figure 6In conjunction with the above embodiments, in some embodiments, the first buffer portion 21 is provided with a positioning protrusion 26 on the side facing the second buffer portion 22, and the body 10 has a positioning groove 12, with the positioning protrusion 26 embedded in the positioning groove 12.

[0059] It is understandable that a positioning protrusion 26 and a positioning groove 12 are provided at the position where the first buffer part 21 connects to the body 10. The positioning protrusion 26 is connected to the first buffer part 21, and the positioning groove 12 is provided on the body 10. The positioning protrusion 26 is embedded in the interior of the positioning groove 12, which can play a certain positioning role for the first buffer part 21, preventing the position of the first buffer part 21 from easily shifting when it is installed on the body 10. At the same time, it is also beneficial for the connector 40 to pass through the first buffer part 21 and the body 10, reducing the difficulty of installing the connector 40.

[0060] Alternatively, the positioning groove 12 can be set on the first buffer part 21, and the positioning protrusion 26 can be set on the body 10, which can also play a certain positioning effect on the first buffer part 21.

[0061] Please see Figure 4 In conjunction with the above embodiments, this application also provides a vehicle, including a sheet metal part 30, a protective panel structure as described above, and a tailgate structure 50. A connector 40 of the protective panel structure is connected to the sheet metal part 30 so that the first buffer portion 21 of the protective panel structure is connected to the sheet metal part 30. The tailgate structure 50 includes a door body 51 and a third buffer portion 52 connected together. When the door body 51 is closed, the third buffer portion 52 is used to connect with the first buffer portion 21 of the protective panel structure.

[0062] Understandably, during the installation of the rear combination light, the cover and housing are first welded together using hot plate welding. Then, the protective plate structure is connected to the housing of the rear combination light, typically using positioning pins to locate the connection position, followed by pre-locking using a snap-fit ​​structure, and finally, fixing the protective plate structure to the housing with screws. Next, the second buffer part 22 is installed on the body 10 of the protective plate structure via the pre-connection part 25. Then, the entire rear combination light is installed onto the sheet metal part 30 of the vehicle body, using positioning pins, ball joints, and snap-fit ​​structures for positioning. A connector 40 passes through the first buffer part 21, the body 10, the second buffer part 22, and the sheet metal part 30 to connect the four components, ensuring that the first buffer part 21 is located on the side of the body 10 facing away from the sheet metal part 30, and that at least a portion of the second buffer part 22 is connected between the body 10 and the sheet metal part 30. Other positions of the body 10 and the sheet metal part 30 can also be connected using bolts to improve the stability of the connection.

[0063] When the tailgate structure 50 on the vehicle is closed, the door body 51 drives the third buffer part 52 to impact the protective plate structure. Since the position of the first buffer part 21 on the protective plate structure corresponds to the position of the third buffer part 52, the third buffer part 52 impacts the first buffer part 21 instead of directly acting on the body 10. The impact force on the body 10 can be reduced by the buffering effect of the first buffer part 21. At the same time, the impact force will be transmitted through the body 10 to the second buffer part 22 between the body 10 and the sheet metal part 30. The vibration can be reduced by the buffering effect of the second buffer part 22, further reducing the impact force on the body 10 and preventing the body 10 from being damaged.

[0064] Please see Figure 1 , Figure 4 and Figure 7 In conjunction with the above embodiments, in some embodiments, the first buffer part 21 has a first connecting surface 212 on the side opposite to the second buffer part 22 of the guard plate structure, and the third buffer part 52 has a second connecting surface 521. Both the first connecting surface 212 and the second connecting surface 521 are planar. When the door 51 is closed, the first connecting surface 212 is connected to the second connecting surface 521.

[0065] Understandably, when the third buffer part 52 collides with the first buffer part 21, the second connecting surface 521 on the third buffer part 52 comes into contact with the first connecting surface 212 on the first buffer part 21. Since both the first connecting surface 212 and the second connecting surface 521 are planar, they have a large contact area, which facilitates the transmission of force to the first buffer part 21 and ensures a good buffering effect. Specifically, the contact area of ​​the first connecting surface 212 and the second connecting surface 521 can account for more than half of the area of ​​the first connecting surface 212, allowing the force from the third buffer part 52 to be borne by a large area, thus preventing damage to the first buffer part 21 due to excessive force and insufficient bearing surface.

[0066] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0068] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A shield structure, characterized by, For connection with sheet metal parts (30), the guard plate structure includes: Ontology(10); The buffer assembly (20) includes a first buffer portion (21) and a second buffer portion (22). The first buffer portion (21) is located on one side of the body (10) and is connected to the body (10). At least a portion of the second buffer portion (22) is disposed on the side of the body (10) opposite to the first buffer portion (21) and is connected to the body (10). The side of the second buffer portion (22) opposite to the first buffer portion (21) is used to connect to the sheet metal part (30).

2. The protective plate structure according to claim 1, characterized in that, The second buffer section (22) includes a first body (221) and a second body (222) connected to each other. The first body (221) is disposed on the side of the body (10) away from the first buffer section (21). The second body (222) passes through the body (10) and is connected to the first buffer section (21).

3. The protective plate structure according to claim 1, characterized in that, The protective plate structure also includes: A connector (40) is respectively inserted through the first buffer part (21), the body (10) and the second buffer part (22), and the connector (40) is used to connect the first buffer part (21) and the second buffer part (22) to the body (10).

4. The protective plate structure according to claim 3, characterized in that, The first buffer section (21) has a receiving cavity (211); the buffer assembly (20) further includes: A first gasket portion (23) is at least partially disposed within the receiving cavity (211), the first gasket portion (23) is disposed around the connector (40), and at least a portion of the connector (40) is located on the side of the first gasket portion (23) away from the second buffer portion (22).

5. The protective plate structure according to claim 3, characterized in that, The buffer component (20) also includes: The second pad portion (24) is disposed on the side of the body (10) away from the first buffer portion (21) and is connected to the body (10) and the second buffer portion (22) respectively. The second pad portion (24) is disposed around the connector (40).

6. The protective plate structure according to claim 5, characterized in that, The main body (10) has a placement groove (11) on the side opposite to the first buffer part (21), and the second pad part (24) is disposed in the placement groove (11).

7. The protective plate structure according to claim 1, characterized in that, The buffer component (20) also includes: The second buffer section (22) is pre-connected to the body (10) through the pre-connection section (25).

8. The protective plate structure according to claim 1, characterized in that, The first buffer part (21) is provided with a positioning protrusion (26) on the side facing the second buffer part (22), and the body (10) has a positioning groove (12), and the positioning protrusion (26) is embedded in the positioning groove (12).

9. A vehicle, characterized in that, include: Sheet metal parts (30); According to any one of claims 1 to 8, the connecting member (40) of the protective plate structure is connected to the sheet metal part (30) so that the first buffer part (21) of the protective plate structure is connected to the sheet metal part (30); The rear door structure (50) includes a door body (51) and a third buffer part (52) connected together. When the door body (51) is closed, the third buffer part (52) is used to connect with the first buffer part (21) of the guard plate structure.

10. The vehicle according to claim 9, characterized in that, The first buffer part (21) has a first connecting surface (212) on the side opposite to the second buffer part (22) of the guard plate structure, and the third buffer part (52) has a second connecting surface (521). Both the first connecting surface (212) and the second connecting surface (521) are planar. When the door (51) is closed, the first connecting surface (212) is connected to the second connecting surface (521).

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