Packaging box

Abstract

The application relates to a packaging box which comprises a box body, a bottom guard plate and a cover plate structure, the box body comprises an inner support plate and an outer box body, the outer box body comprises side plates, a bottom plate and a containing space, the side plates are connected with the bottom plate, the containing space comprises an opening which is oppositely arranged on the bottom plate, the side plates comprise a sandwich space, the containing space is not communicated with the sandwich space, and the inner support plate is embedded in the sandwich space; the bottom guard plate is connected with the bottom plate of the outer box body; the cover plate structure is connected with the side plates of the outer box body, and the cover plate structure is used for opening or closing the opening of the outer box body so as to open or close the packaging box; the inner support plate effectively enhances the supporting force of the side of the outer box body, the bottom guard plate enhances the supporting force of the bottom of the outer box body; the cover plate structure enhances the supporting force of the top of the packaging box; and the cover plate structure, the inner support plate and the bottom guard plate synergistically act to effectively enhance the protection capability of the overall structure of the packaging box.

Description

Technical Field

[0001] This application relates to the field of paper packaging boxes, and in particular to a type of packaging box. Background Technology

[0002] Large paper packaging boxes, made primarily of paper, are widely used in the transportation and storage of bulky and moderately heavy goods such as home appliances, electronic equipment, mechanical parts, and large daily necessities. Compared to wooden or metal packaging boxes, their core advantages lie in their lightweight, environmental friendliness, and cost-effectiveness. Furthermore, the elasticity and cushioning properties of paper effectively absorb vibrations and impacts during transportation, making it a packaging form currently being promoted in the field of green logistics.

[0003] However, the overall compressive strength of existing large paper packaging boxes is still generally insufficient, which has become a key weakness restricting their application reliability. Utility Model Content

[0004] This application provides a packaging box that helps improve the overall structural strength of the packaging box.

[0005] This application provides a packaging box, which includes a box body, a bottom protective plate, and a cover structure. The box body includes an inner support plate and an outer box body. The outer box body includes side plates, a bottom plate, and a receiving space. The side plates are connected to the bottom plate. The receiving space includes an opening that is opposite to the bottom plate. The side plates include a mezzanine space. The receiving space and the mezzanine space are not connected. The inner support plate is embedded in the mezzanine space. The bottom protective plate is connected to the bottom plate of the outer box body. The cover structure is connected to the side plates of the outer box body. The cover structure is used to open or close the opening of the outer box body to open or close the packaging box.

[0006] The packaging box of this application embodiment features a sandwich space within the side panel of the outer box, with an inner support plate embedded within this space. The inner support plate effectively enhances the support strength of the outer box's sides. A bottom guard plate on the bottom plate of the outer box effectively supports the bottom of the outer box. The inner support plate and the bottom guard plate work together to effectively enhance the overall protective capability of the packaging box structure.

[0007] In some feasible implementations, the side panel includes a first sub-side panel and a second sub-side panel disposed opposite to each other, and the cover structure includes a first cover plate and a second cover plate, the first cover plate and the second cover plate being connected to the first sub-side panel and the second sub-side panel respectively, the first cover plate and the second cover plate being used to open or close the opening.

[0008] In some possible implementations, the first cover plate includes a first sub-cover plate and a second sub-cover plate connected together, and the second cover plate includes a third sub-cover plate and a fourth sub-cover plate connected together. The first sub-cover plate and the third sub-cover plate are respectively connected to the first sub-side plate and the second sub-side plate. The first sub-cover plate and the fourth sub-cover plate are used to open or close the opening.

[0009] In some possible implementations, the first sub-cover includes a first overlap portion extending beyond the second sub-cover, the fourth sub-cover includes a second overlap portion extending beyond the third sub-cover, and the packaging box also includes a first connector and a second connector, one of which is disposed at the first overlap portion and the other at the second overlap portion. When the first sub-cover and the fourth sub-cover close the opening, the first overlap portion and the second overlap portion overlap each other, and the first connector and the second connector are connected.

[0010] In some feasible embodiments, the first sub-cover plate and the third sub-cover plate are bonded to the outer surfaces of the first sub-side plate and the second sub-side plate, respectively; the second sub-cover plate is bonded to the surface of the first sub-cover plate facing the receiving space; and the fourth sub-cover plate is bonded to the surface of the third sub-cover plate facing the receiving space.

[0011] In some feasible implementations, the side panel includes a first sub-side panel and a second sub-side panel disposed opposite to each other, and the cover structure includes a connected third cover and a third overlap, the third cover and the first sub-side panel are connected, the third cover is used to open or close the opening, and when the third cover closes the opening, the third overlap is connected to the second sub-side panel.

[0012] In some feasible embodiments, the packaging box also includes a first connector and a second connector, one of which is disposed at the third overlapping portion and the other is disposed at the second sub-side plate. When the third cover closes the opening, the third overlapping portion and the second sub-side plate overlap each other, and the first connector and the second connector are connected.

[0013] In some possible implementations, one of the first connector and the second connector includes a magnet and the other includes an iron sheet; or, both the first connector and the second connector include magnets.

[0014] In some feasible implementations, the bottom guard plate includes a curved edge that is recessed toward the center area of ​​the bottom guard plate, forming a stepped structure between the curved edge and the bottom plate.

[0015] In some feasible implementations, the mezzanine space is an annular space, and the inner support plate is an annular structural component. Attached Figure Description

[0016] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the packaging box provided in some embodiments of this application;

[0018] Figure 2 This is a first-view structural diagram of a packaging box provided for some embodiments of this application;

[0019] Figure 3 This is a second-view structural diagram of a packaging box provided in some embodiments of this application;

[0020] Figure 4 This is an exploded view of the packaging box provided in some embodiments of this application;

[0021] Figure 5 Schematic diagram of the structure of the side panel of the packaging box provided in some embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the overall structure of a packaging box provided for other embodiments of this application.

[0023] The accompanying drawings are not necessarily drawn to scale.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Box body;

[0026] 2. Bottom protective plate;

[0027] 3. Cover plate structure; 31. First cover plate; 311. First sub-cover plate; 312. Second sub-cover plate; 32. Second cover plate; 321. Third sub-cover plate; 322. Fourth sub-cover plate; 33. Third cover plate;

[0028] 4. Inner support plate;

[0029] 5. Outer casing; 51. Side panel; 511. First sub-side panel; 512. Second sub-side panel; 52. Bottom plate; 53. Accommodation space;

[0030] 61. First lap joint; 62. Second lap joint; 63. Third lap joint;

[0031] 71. First connector; 72. Second connector;

[0032] 8. Mezzanine space. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0035] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0038] In this application, "multiple" means two or more (including two).

[0039] See Figures 1 to 5 As shown, this application embodiment provides a packaging box, which includes a box body 1, a bottom protective plate 2, and a cover structure 3. The box body 1 includes an inner support plate 4 and an outer box body 5. The outer box body 5 includes a side plate 51, a bottom plate 52, and a receiving space 53. The side plate 51 is connected to the bottom plate 52. The receiving space 53 includes an opening. The opening is disposed opposite to the bottom plate 52. The side plate 51 includes a mezzanine space 8. The receiving space 53 is not in communication with the mezzanine space 8. The inner support plate 4 is embedded in the mezzanine space 8. The bottom protective plate 2 is connected to the bottom plate 52 of the outer box body 5. The cover structure 3 is connected to the side plate 51 of the outer box body 5. The cover structure 3 is used to open or close the opening of the outer box body 5 to open or close the packaging box.

[0040] In some feasible embodiments, the base plate 52 includes a first sub-base plate, a second sub-base plate, a third sub-base plate, and a fourth sub-base plate, with the first and third sub-base plates disposed opposite each other on both sides of the outer housing 5, and the second and fourth sub-base plates disposed opposite each other on both sides of the outer housing 5.

[0041] In some feasible methods, the inner support plate 4 is first placed into the interlayer space 8, and then the first sub-base plate, the second sub-base plate, the third sub-base plate and the fourth sub-base plate are folded and glued in sequence. After the glue is completed, the bottom guard plate 2 is connected to the base plate 52.

[0042] The packaging box of this application embodiment features a mezzanine space 8 within the side panel 51 of the outer box 5, with an inner support plate 4 embedded within the mezzanine space 8. The inner support plate 4 effectively enhances the support force on the sides of the outer box 5. A bottom guard plate 2 is provided on the bottom plate 52 of the outer box 5, effectively supporting the bottom of the outer box 5. The inner support plate 4 and the bottom guard plate 2 work together to effectively enhance the overall protective capability of the packaging box structure.

[0043] In some feasible ways, the bottom guard plate 2 and the bottom plate 52 of the outer casing 5 can be connected by means of adhesive or staple penetration.

[0044] In some feasible ways, such as Figure 4 As shown, the side plate 51 includes a first sub-side plate 511 and a second sub-side plate 512 disposed opposite to each other. The cover plate structure 3 includes a first cover plate 31 and a second cover plate 32. The first cover plate 31 and the second cover plate 32 are respectively connected to the first sub-side plate 511 and the second sub-side plate 512.

[0045] The first cover plate 31 and the second cover plate 32 are used to open or close the opening.

[0046] In some feasible methods, when in use, the first cover plate 31 is first glued to the first sub-side plate 511, and the second cover plate 32 is glued to the second sub-side plate 512. When opening the cover, the first cover plate 31 and the second cover plate 32 are folded outward, separating the first cover plate 31 and the second cover plate 32. The first cover plate 31 and the second cover plate 32 do not block the opening, allowing items to be taken out of the receiving space 53 or placed into the receiving space 53. When closing the cover, the first cover plate 31 and the second cover plate 32 are folded inward, causing the first cover plate 31 and the second cover plate 32 to overlap and block the opening, forming a closed receiving space 53.

[0047] By setting the first cover 31 and the second cover 32, the opening and closing of the packaging box can be controlled on one side. When only one side of the packaging box needs to be filled with items, only one cover needs to be opened, without opening both covers simultaneously. For example, when it is necessary to take out an item from the side of the first cover 31, if there is an item on the first cover 31, simply move the item to the top of the second cover 32, open the first cover 31 to take out the required item, and then move the item on the second cover 32 back to the first cover 31. There is no need to remove the item on the first cover 31, making the use of the packaging box more flexible and convenient, and improving user experience satisfaction.

[0048] In some feasible ways, the first cover plate 31 and the first sub-side plate 511 can be connected by means of adhesive or staple penetration; the second cover plate 32 and the second sub-side plate 512 can be connected by means of adhesive or staple penetration.

[0049] In some feasible ways, such as Figure 4 As shown, the first cover plate 31 includes a first sub-cover plate 311 and a second sub-cover plate 312 connected together. The second cover plate 32 includes a third sub-cover plate 321 and a fourth sub-cover plate 322 connected together. The first sub-cover plate 311 and the third sub-cover plate 321 are respectively connected to the first sub-side plate 511 and the second sub-side plate 512. The first sub-cover plate 311 and the fourth sub-cover plate 322 are used to open or close the opening.

[0050] In some feasible ways, the second sub-cover plate 312 is first connected to the first sub-cover plate 311, the fourth sub-cover plate is connected to the third sub-cover plate 321, the first sub-cover plate 311 is connected to the first sub-side plate 511, and the third sub-cover plate 321 is connected to the second sub-side plate 512.

[0051] By setting up a two-layer sub-cover structure 3, the support of the cover structure 3 is strengthened. When stacking packaging boxes, the two-layer sub-cover structure 3 makes the packaging boxes less likely to collapse, effectively enhancing the overall structural support of the packaging boxes.

[0052] In some feasible embodiments, the first sub-cover plate 311 and the second sub-cover plate 312 can be connected, but are not limited to, by means of adhesive bonding or staple penetration. The third sub-cover plate 321 and the fourth sub-cover plate 322 can be connected, but are not limited to, by means of adhesive bonding or staple penetration. The first sub-cover plate 311 and the first sub-side plate 511 can be connected, but are not limited to, by means of adhesive bonding or staple penetration. The third sub-cover plate 321 and the second sub-side plate 512 can be connected, but are not limited to, by means of adhesive bonding or staple penetration.

[0053] In some feasible ways, such as Figure 2As shown, the first sub-cover 311 includes a first overlapping portion 61 extending beyond the second sub-cover 312. The fourth sub-cover 322 includes a second overlapping portion 62 extending beyond the third sub-cover 321. The packaging box also includes a first connector 71 and a second connector 72. One of the first connector 71 and the second connector 72 is disposed at the first overlapping portion 61, and the other is disposed at the second overlapping portion 62. When the first sub-cover 311 and the fourth sub-cover 322 close the opening, the first overlapping portion 61 and the second overlapping portion 62 overlap each other, and the first connector 71 and the second connector 72 are connected.

[0054] In some feasible implementations, the first connector 71 is connected to the first overlapping portion 61 of the first sub-cover 311, and the second connector 72 is connected to the second overlapping portion 62 of the fourth sub-cover 322. When the cover is opened, the first cover 31 and the second cover 32 are folded outwards, so that the first overlapping portion 61 and the second overlapping portion 62 are separated, and the first sub-cover 311, the second sub-cover 312, the third sub-cover 321, and the fourth sub-cover 322 do not obstruct the opening, allowing items to be taken out of the containing space 53 or placed into the containing space 53. When the cover is closed, the first cover 31 and the second cover 32 are folded inwards, so that the first overlapping portion 61 and the second overlapping portion 62 overlap, obstructing the opening and forming a closed containing space 53, preventing items from falling out of the containing space 53.

[0055] By setting the first connector 71 and the second connector 72 to be connected to the first overlapping part 61 and the second overlapping part 62 respectively, when the first overlapping part 61 and the second overlapping part 62 overlap, the first connector 71 and the second connector 72 are connected and locked, eliminating the need to use adhesive tape to lock the first cover plate 31 and the second cover plate 32, making it more convenient to use and reusable, thus improving the utilization rate of the packaging box.

[0056] In some feasible ways, the first connector 71 may be connected to the first overlapping portion 61 by means of embedding or adhesive bonding; the second connector 72 may be connected to the second overlapping portion 62 by means of embedding or adhesive bonding.

[0057] In some feasible ways, such as Figure 6 As shown, the first sub-cover plate 311 and the third sub-cover plate 321 are respectively bonded to the outer surfaces of the first sub-side plate 511 and the second sub-side plate 512. The second sub-cover plate 312 is bonded to the surface of the first sub-cover plate 311 facing the receiving space 53. The fourth sub-cover plate 322 is bonded to the surface of the third sub-cover plate 321 facing the receiving space 53.

[0058] In some feasible methods, adhesive is applied to the surfaces of the first sub-cover plate 311 and the third sub-cover plate 321, and also to the outer surfaces of the first sub-side plate 511 and the second sub-side plate 512. The adhesive-coated surfaces of the first sub-cover plate 311 and the third sub-cover plate 321 are then aligned with the adhesive-coated surfaces of the second sub-side plate 512 and bonded together. After the adhesive has cured, the connection between the first sub-cover plate 311 and the first sub-side plate 511, and between the third sub-cover plate 321 and the second sub-side plate 512, is completed. Alternatively, adhesive is applied to the surfaces of the first sub-cover plate 311 and the third sub-cover plate 321 facing the receiving space 53, and also to the surfaces of the second sub-cover plate 312 and the fourth sub-cover plate 322. Then, the first sub-cover plate 311 and the second sub-cover plate 312 are bonded together, and the third sub-cover plate 321 and the fourth sub-cover plate 322 are bonded together.

[0059] By bonding the first sub-cover plate 311 and the third sub-cover plate 321 to the outer surfaces of the first sub-side plate 511 and the second sub-side plate 512 respectively, the first sub-cover plate 311 and the third sub-cover plate 321 can strengthen the structural strength of the first sub-side plate 511 and the second sub-side plate 512 while being connected and fixed to them, thereby enhancing the supporting force of the first sub-side plate 511 and the second sub-side plate 512 and further enhancing the overall structural strength of the packaging box.

[0060] By setting a second sub-cover plate 312 to be bonded to the first sub-cover plate 311, and a fourth sub-cover plate 322 to be bonded to the third sub-cover plate 321, the second and fourth sub-cover plates 312 and 322, while being connected and fixed to the first and third sub-cover plates 311 and 321, can enhance the structural strength of the first and third sub-cover plates 311 and 321, thereby increasing the supporting force of the first and third sub-cover plates 311 and further enhancing the structural strength of the packaging box.

[0061] Meanwhile, the second sub-cover 312 and the fourth sub-cover 322 are attached to the surfaces of the first sub-cover 311 and the third sub-cover 321 facing the receiving space 53, so that the second sub-cover 312 and the fourth sub-cover 322 are not visible from the outside of the packaging box, thereby enhancing the aesthetics of the packaging box.

[0062] In some feasible ways, such as Figure 6 As shown, the side panel 51 includes a first sub-side panel 511 and a second sub-side panel 512 disposed opposite to each other. The cover structure 3 includes a connected third cover plate 33 and a third overlapping portion 63. The third cover plate 33 is connected to the first sub-side panel 511. The third cover plate 33 is used to open or close the opening. When the third cover plate 33 closes the opening, the third overlapping portion 63 is connected to the second sub-side panel 512.

[0063] In some feasible ways, when the lid is opened, the third cover plate 33 is folded outward, the third overlapping part 63 separates from the second sub-side plate 512, and the third cover plate 33 does not block the opening, so as to take out or put items in the receiving space 53; when the lid is closed, the third cover plate 33 is folded inward, so that the third overlapping part 63 and the second sub-side plate 512 overlap, and the third cover plate 33 blocks the opening, forming a closed receiving space 53.

[0064] In some examples, the third cover plate 33 is bonded to the first sub-side plate 511, and the third overlap 63 is bonded to the third cover plate 33.

[0065] In some feasible ways, such as Figure 6 As shown, the packaging box also includes a first connector 71 and a second connector 72. One of the first connector 71 and the second connector 72 is disposed on the third overlapping portion 63. The other is disposed on the second sub-side plate 512. When the third cover plate 33 closes the opening, the third overlapping portion 63 and the second sub-side plate 512 overlap each other, and the first connector 71 and the second connector 72 are connected.

[0066] In some possible implementations, the first connector 71 is connected to the third overlap 63, and the second connector 72 is connected to the second sub-side plate 512.

[0067] When the cover is opened, the third cover plate 33 is folded outward, so that the third overlapping part 63 and the second sub-side plate 512 are separated, the first connector 71 and the second connector 72 are not connected, and the third cover plate 33 does not block the opening, which is used to take out items in the accommodating space 53 or put items into the accommodating space 53.

[0068] When closed, the third cover plate 33 is folded inward, so that the third overlapping part 63 and the second sub-side plate 512 overlap, the first connector 71 and the second connector 72 are connected, and the third cover plate 33 blocks the opening, forming a closed receiving space 53 to prevent items in the receiving space 53 from falling out.

[0069] By setting the third overlapping part 63 to overlap with the second sub-side plate 512, when the third overlapping part 63 overlaps with the second sub-side plate 512, the first connecting member 71 and the second connecting member 72 are connected and locked. There is no need to use tape to lock the third cover plate 33 and the second sub-side plate 512, which makes it more convenient to use and can be reused, thus improving the utilization rate of the packaging box.

[0070] In some possible implementations, the first connector 71 may be connected to the second sub-side plate 512 by means of embedding or adhesive bonding; the second connector 72 may be connected to the third overlapping portion 63 by means of embedding or adhesive bonding.

[0071] In some possible implementations, one of the first connector 71 and the second connector 72 includes a magnet and the other includes an iron sheet; or, both the first connector 71 and the second connector 72 include magnets.

[0072] In some feasible ways, the first connector 71 is a magnet and the second connector 72 is an iron sheet, with the first connector 71 attracting the second connector 72 through its own magnetism.

[0073] In some feasible ways, such as Figure 4 As shown, the bottom guard plate 2 includes an arc-shaped edge. The arc-shaped edge is recessed towards the center area of ​​the bottom guard plate 2. A stepped structure is formed between the arc-shaped edge and the bottom plate 52.

[0074] By designing an arc-shaped edge that is recessed towards the center of the bottom protective plate 2, the edge of the bottom protective plate 2 is not visible when the packaging box is placed on the ground. This design enhances the structural strength of the outer box body 5 and the bottom plate 52 while maintaining the aesthetic appeal of the packaging box. Furthermore, the arc-shaped edge and the bottom plate 52 form a stepped structure, facilitating finger insertion and making handling easier, thus improving user satisfaction.

[0075] In some feasible ways, such as Figure 5 As shown, the mezzanine space 8 is an annular space. The inner support plate 4 is an annular structural component.

[0076] In some feasible methods, the inner annular support plate 4 is first inserted into the annular interlayer space 8, and then the base plate 52 is glued to enclose the inner support plate 4, thereby preventing the inner support plate 4 from falling off the interlayer space 8.

[0077] By embedding the inner support plate 4 into the interlayer space 8, the support force of the side plate 51 of the outer box 5 is effectively enhanced, thereby increasing the structural strength of the packaging box.

[0078] In some examples, the inner support plate 4 and the mezzanine space 8 are interference-fitted.

[0079] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A packaging box, characterized in that, include: The enclosure includes an inner support plate and an outer enclosure. The outer enclosure includes a side plate, a bottom plate, and a receiving space. The side plate is connected to the bottom plate. The receiving space includes an opening that is opposite to the bottom plate. The side plate includes a mezzanine space. The receiving space and the mezzanine space are not connected. The inner support plate is embedded in the mezzanine space. The bottom protective plate is connected to the bottom plate of the outer casing; A cover structure is connected to the side panel of the outer box, and the cover structure is used to open or close the opening of the outer box to open or close the packaging box.

2. The packaging box according to claim 1, characterized in that, The side panel includes a first sub-side panel and a second sub-side panel disposed opposite to each other. The cover plate structure includes a first cover plate and a second cover plate, the first cover plate and the second cover plate being connected to the first sub-side plate and the second sub-side plate respectively, and the first cover plate and the second cover plate being used to open or close the opening.

3. The packaging box according to claim 2, characterized in that, The first cover plate includes a first sub-cover plate and a second sub-cover plate connected together, and the second cover plate includes a third sub-cover plate and a fourth sub-cover plate connected together. The first sub-cover plate and the third sub-cover plate are respectively connected to the first sub-side plate and the second sub-side plate, and the first sub-cover plate and the fourth sub-cover plate are used to open or close the opening.

4. The packaging box according to claim 3, characterized in that, The first sub-cover plate includes a first overlap portion extending beyond the second sub-cover plate, and the fourth sub-cover plate includes a second overlap portion extending beyond the third sub-cover plate. The packaging box further includes a first connector and a second connector, one of which is disposed at the first overlapping portion and the other is disposed at the second overlapping portion. When the first sub-cover plate and the fourth sub-cover plate close the opening, the first overlapping part and the second overlapping part overlap each other, and the first connecting member and the second connecting member are connected.

5. The packaging box according to claim 3, wherein The first sub-cover plate and the third sub-cover plate are respectively bonded to the outer surfaces of the first sub-side plate and the second sub-side plate. The second sub-cover plate is bonded to the surface of the first sub-cover plate facing the receiving space. The fourth sub-cover plate is bonded to the surface of the third sub-cover plate facing the accommodating space.

6. The packaging box according to claim 1, characterized in that, The side panel includes a first sub-side panel and a second sub-side panel disposed opposite to each other. The cover plate structure includes a connected third cover plate and a third overlapping portion. The third cover plate is connected to the first sub-side plate, and the third cover plate is used to open or close the opening. When the third cover plate closes the opening, the third overlapping portion is connected to the second sub-side plate.

7. The packaging box according to claim 6, characterized in that, The packaging box also includes a first connector and a second connector, one of which is disposed at the third overlapping portion, and the other is disposed at the second sub-side panel. When the third cover plate closes the opening, the third overlapping part and the second sub-side plate overlap each other, and the first connector and the second connector are connected.

8. A packaging box according to claim 4 or 7, characterized in that One of the first connector and the second connector includes a magnet, and the other includes an iron sheet; or, Both the first connector and the second connector include magnets.

9. The packaging box according to any one of claims 1 to 8, characterized in that, The bottom guard plate includes an arc-shaped edge that is recessed toward the center area of ​​the bottom guard plate, and a stepped structure is formed between the arc-shaped edge and the bottom plate.

10. The packaging box according to any one of claims 1 to 8, characterized in that, The interlayer space is an annular space, and the inner support plate is an annular structural component.

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