Packaging box

Abstract

The utility model relates to the technical field of packaging and filling, and provides a packaging box which comprises a box body, a box cover, a first paper support and a second paper support. The box body is provided with a first groove body with at least one side open, and the box cover is arranged on the opening of the first groove body in an openable and closable mode. The first paper support and the second paper support are oppositely arranged and are arranged in the first groove body, the sides, deviating from each other, of the first paper support and the second paper support abut against the inner wall of the first groove body, the opposite sides of the first paper support and the second paper support are provided with a second groove body and a third groove body, and the second groove body and the third groove body oppositely form a clamping space. The clamp is used for clamping and fixing articles. According to the packaging box, the first paper support and the second paper support which are oppositely arranged are arranged in the first groove body, and the second groove body and the third groove body which are arranged on the opposite sides of the first paper support and the second paper support can form the clamping space to fix articles, so that the articles in the packaging box can be effectively prevented from shaking or colliding.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging and filling, in particular to a packaging box. Background Art

[0002] In the related art, when transporting fragile and fragile items, in order to prevent the items from being damaged due to impact or collision during transportation, it is usually necessary to fill the packaging box with expanded polystyrene (EPS, commonly known as foam) as a buffer to reduce the impact or collision of the items. However, this foam filler is not conducive to recycling and is prone to cause environmental pollution. Utility Model Content

[0003] The utility model provides a packaging box, which is used to solve the problem in the prior art that foam filling materials are not conducive to recycling and easily cause environmental pollution when fragile goods are transported.

[0004] The utility model provides a packaging box, comprising:

[0005] A box body and a box cover, wherein the box body is provided with a first slot body with at least one side opening, and the box cover can be opened and closed at the opening of the first slot body;

[0006] A first paper support and a second paper support are arranged opposite to each other, the first paper support and the second paper support are arranged on the first groove body, the sides of the first paper support and the second paper support facing away from each other are respectively abutted against the inner wall of the first groove body, a second groove body and a third groove body are arranged on opposite sides of the first paper support and the second paper support, and the second groove body and the third groove body form a clamping space opposite to each other for clamping and fixing articles.

[0007] According to the packaging box of the utility model, first convex ribs are protruded from the inner walls on two opposite sides of the second slot body and / or the third slot body, and the first convex ribs are used to abut against the opposite sides of the article.

[0008] According to the packaging box of the utility model, the first paper holder and / or the second paper holder is provided with a second convex rib on one side facing the inner wall of the first slot body, and the second convex rib abuts against the inner wall of the first slot body;

[0009] Alternatively, a protrusion is provided on a side of the first paper holder and / or the second paper holder facing the inner wall of the first slot body, and the protrusion abuts against the inner wall of the first slot body.

[0010] According to the packaging box of the utility model, a fourth slot body is provided on a side of the first paper holder and / or the second paper holder facing the inner wall of the first slot body.

[0011] According to the packaging box of the utility model, there are a plurality of the fourth slot bodies, and the plurality of the fourth slot bodies are arranged at intervals.

[0012] The packaging box according to the utility model further includes an accessory box;

[0013] A first accommodating gap is provided between the clamping space and an inner wall of one side of the first slot body; and the accessory box is arranged in the first accommodating gap.

[0014] According to the packaging box of the utility model, the inner walls of the second groove body and the third groove body are both provided with third convex ribs, and the third convex ribs of the second groove body and the third groove body are used to abut against the same side of the article;

[0015] The first accommodating gap is formed between the second groove body and the third rib of the third groove body.

[0016] The packaging box according to the utility model also includes a mask protection bag;

[0017] A second accommodating gap is provided between the clamping space and an inner wall of one side of the first groove body; the mask protection bag is arranged in the second accommodating gap.

[0018] According to the packaging box of the utility model, the box cover and the box body are an integrated structure, and the box cover can be folded and installed on the box body.

[0019] According to the packaging box of the utility model, the box cover includes a first part and a second part;

[0020] The first part is foldably connected to the box body, and the first part can be folded to cover or stay away from the opening;

[0021] The second part includes a fitting part and an inserting part, the fitting part is foldably connected to the first part, the inserting part is arranged at two ends of the fitting part, and the box body is provided with an inserting groove corresponding to the inserting part;

[0022] When the first part covers the opening, the fitting portion can be folded to fit with the side wall of the box body, so that the plug-in portion is inserted into the plug-in slot.

[0023] The packaging box of the utility model is provided with a first slot body in the box body to accommodate a paper tray and articles, and a box cover is provided at the opening of the first slot body, and the box cover can close or open the opening of the first slot body so as to store, put in or take out articles and the paper tray; at the same time, by providing a first paper tray and a second paper tray that are relatively arranged in the first slot body, the second slot body and the third slot body on the opposite sides of the first paper tray and the second paper tray can form a clamping space to clamp the articles, and the sides of the first paper tray and the second paper tray that are away from each other are respectively abutted against the inner wall of the first slot body, so as to fix the articles in the first slot body, which can effectively prevent the articles in the packaging box from shaking or bumping, and does not need to be filled with foam, which effectively solves the problem in the prior art that foam filling materials are not conducive to recycling when transporting fragile articles and are prone to causing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of a first paper holder and a second paper holder clamping an article provided by an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of a first paper tray and a second paper tray clamping an article provided by another embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of a box body and a box cover provided by an embodiment of the utility model;

[0028] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0029] Figure 5 is a schematic diagram of an accessory box provided by another embodiment of the utility model;

[0030] Figure 6 It is a schematic diagram of a mask protection bag provided by another embodiment of the utility model.

[0031] Reference numerals:

[0032] 11. box body; 111. first slot body; 112. plug-in slot;

[0033] 12. Box cover; 121. First part; 122. Second part; 123. Fitting part; 124. Insertion part;

[0034] 13. first paper support; 131. first convex rib; 132. second convex rib; 133. raised portion; 134. third convex rib;

[0035] 14. Second paper tray; 15. Accessory box; 16. Mask protection bag;

[0036] 2. Items. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] In the description of the embodiments of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Combine the following Figure 1-6 The utility model describes a packaging box.

[0041] like Figures 1 to 3As shown, the utility model provides a packaging box, comprising: a box body 11, a box cover 12, a first paper support 13 and a second paper support 14; the box body 11 is provided with a first slot body 111 with at least one side open, and the box cover 12 can be opened and closed at the opening of the first slot body 111; the first paper support 13 and the second paper support 14 are arranged opposite to each other, and the first paper support 13 and the second paper support 14 are arranged in the first slot body 111, and the sides of the first paper support 13 and the second paper support 14 facing away from each other are respectively abutted against the inner wall of the first slot body 111, and the second slot body and the third slot body are provided on the opposite sides of the first paper support 13 and the second paper support 14, and the second slot body and the third slot body are relatively formed with a clamping space for clamping and fixing the article 2.

[0042] In this embodiment, the packaging box includes a box body 11 and a box cover 12. The box body 11 is provided with a first slot 111 to accommodate the paper holder and the article 2. At least one side of the first slot 111 is provided with an opening to place the paper holder and the article 2 in the first slot 111 or take the paper holder and the article 2 out of the first slot 111. By arranging the box cover 12 at the position of the opening of the first slot 111, the box cover 12 can close the first slot 111 when the article 2 needs to be stored or transported, and open the opening when the article 2 needs to be taken out or placed in. At the same time, by The first paper support 13 and the second paper support 14 are placed in the body 111. The first paper support 13 and the second paper support 14 are arranged opposite to each other, and a second groove body and a third groove body are formed on the opposite sides. The first paper support 13 and the second paper support 14 can be respectively sleeved on both sides of the article 2 through the second groove body and the third groove body, so as to clamp the article 2. The side of the first paper support 13 and the second paper support 14 facing away from each other abuts against the inner wall of the first groove body 111, so that the first paper support 13, the article 2, and the second paper support 14 are fixed in the first groove body 111 without shaking, thereby avoiding shaking or bumping of the article 2 in the mobile packaging box.

[0043] The packaging box of the utility model is provided with a first slot body 111 in the box body 11 to accommodate the paper tray and the article 2, and a box cover 12 is provided at the opening of the first slot body 111, and the box cover 12 can close or open the opening of the first slot body 111 so as to store, put in or take out the article 2 and the paper tray; at the same time, by providing a first paper tray 13 and a second paper tray 14 that are relatively arranged in the first slot body 111, the second slot body and the third slot body on the opposite sides of the first paper tray 13 and the second paper tray 14 can form a clamping space to clamp the article 2, and the sides of the first paper tray 13 and the second paper tray 14 that are away from each other are respectively abutted against the inner wall of the first slot body 111, so that the article 2 is fixed in the first slot body 111, which can effectively prevent the article 2 in the packaging box from shaking or bumping, and there is no need to fill with foam, which effectively solves the problem in the prior art that the foam filling material is not conducive to recycling when transporting fragile items and is easy to cause environmental pollution.

[0044] It is easy to understand that the shapes of the first trough body 111, the first paper support 13, the second paper support 14, and the second trough body and the third trough body can be designed according to the shape of the actual object 2, and this application does not limit it.

[0045] Optionally, the first paper tray 13 and the second paper tray 14 may be made of corrugated paper.

[0046] Optionally, in some embodiments, Figure 1 and Figure 2 As shown, first convex ribs 131 are convexly disposed on the inner walls of the second groove body on two opposite sides, and the first convex ribs 131 are used to abut against the opposite sides of the object 2.

[0047] In this embodiment, by protruding first ribs 131 on the inner walls on both sides of the opposite sides of the second groove body, on the one hand, the first ribs 131 can serve as reinforcing ribs of the first paper support 13 to strengthen the strength of the first paper support 13 so that the first paper support 13 is not easily deformed; on the other hand, the first ribs 131 on the inner walls on both sides can abut against the opposite sides of the article 2 to further clamp and fix the article 2 so that the article 2 is more stable when stored in the packaging box; at the same time, by providing the first ribs 131, the thickness of the inner wall of the groove body of the first paper support 13 can be reduced to save materials.

[0048] It is easy to understand that the first rib 131 can extend along the height direction of the side wall or along the length direction of the side wall.

[0049] It is easy to understand that, optionally, first convex ribs 131 are convexly provided on the inner walls on two opposite sides of the third groove body, and the first convex ribs 131 are used to abut against the opposite sides of the object 2.

[0050] In this embodiment, the technical effect of the first rib 131 in the third groove body is similar to that of the first rib 131 in the second groove body in the above embodiment, and will not be repeated here.

[0051] In a specific embodiment, Figure 1 As shown, the second groove body and the third groove body are both rectangular grooves, and multiple first ribs 131 are arranged on the inner walls on the upper and lower sides of the two rectangular grooves at intervals along the width direction of the inner walls, and protrusions are arranged on the inner walls on the left and right sides of the two rectangular grooves corresponding to the grooves on the side walls of the article 2.

[0052] Optionally, in some embodiments, Figure 1 As shown, a second convex rib 132 is protruded from one side of the first paper holder 13 facing the inner wall of the first slot body 111 , and the second convex rib 132 abuts against the inner wall of the first slot body 111 .

[0053] In this embodiment, by protruding the second rib 132 on the outer side of the first paper support 13, the second rib 132 can serve as a reinforcing rib of the first paper support 13 to strengthen the strength of the first paper support 13 and make the first paper support 13 less likely to deform; at the same time, by providing the second rib 132, the thickness of the side wall of the first paper support 13 can be reduced to save material.

[0054] It is easy to understand that, optionally, a second convex rib 132 is protruded from one side of the second paper holder 14 facing the inner wall of the first slot body 111 , and the second convex rib 132 abuts against the inner wall of the first slot body 111 .

[0055] In this embodiment, the second convex rib 132 disposed on the second paper support 14 has a similar technical effect to the second convex rib 132 on the first paper support 13 in the above embodiment, and will not be described in detail herein.

[0056] Alternatively, in other embodiments, Figure 2 As shown, a protrusion 133 is provided on one side of the first paper holder 13 and / or the second paper holder 14 facing the inner wall of the first slot body 111 , and the protrusion 133 abuts against the inner wall of the first slot body 111 .

[0057] It is easy to understand that by providing a protrusion 133 on the outside of the first paper holder 13 or the second paper holder 14 to abut against the inner wall of the first groove 111, the thickness of the side wall of the paper holder can be increased while reducing the amount of material used, which has a simple structure and strong practicality.

[0058] In some embodiments, Figure 1 As shown, a fourth slot body is provided on one side of the first paper holder 13 facing the inner wall of the first slot body 111 .

[0059] It is easy to understand that the article 2 usually includes some accessories, which are usually not installed on the article 2 during transportation. In this embodiment, the fourth slot is provided on the side of the first paper holder 13 facing the inner wall of the first slot 111 to accommodate various accessories of the article 2, and the side of the first paper holder 13 facing the inner wall of the first slot 111 abuts against the first slot 111, so that the inner wall of the first slot 111 can cover and seal the top of the fourth slot, and limit the accessories in the fourth slot, so that the accessories can also be put into the packaging box for transportation.

[0060] Optionally, in some embodiments not shown, a fourth slot body is provided on the side of the second paper support 14 facing the inner wall of the first slot body 111 .

[0061] It is easy to understand that the technical effect of the fourth slot body in this embodiment is similar to that of the fourth slot body in the above embodiment, which will not be repeated here.

[0062] It is easy to understand that the shape, size and position of the fourth groove body can be set according to the actual shape of the accessory, so that the inner wall of the fourth groove body can fit the accessory, limit and fix the accessory without shaking or bumping in the fourth groove body. The fourth groove body can also be set on the first paper support 13 or the second paper support 14 according to actual needs, or on both paper supports at the same time.

[0063] Optionally, in some embodiments, Figure 1 As shown, there are multiple fourth slot bodies, and the multiple fourth slot bodies are arranged at intervals.

[0064] In this embodiment, multiple fourth slots are arranged at intervals, and each fourth slot can accommodate an accessory, which has a simple structure and strong practicality. Optionally, the shape of each fourth slot can fit the corresponding accessory, which can not only fit and fix the accessory but also prevent mistakes.

[0065] Optionally, in some embodiments, Figure 2 and Figure 6 As shown, the packaging box also includes an accessory box 15; a first accommodating gap is provided between the clamping space and an inner wall of one side of the first slot body 111; and the accessory box 15 is arranged in the first accommodating gap.

[0066] In this embodiment, an accessory box 15 is provided to accommodate accessories of the item 2, and a first accommodating gap is left between the clamping space and the inner wall of one side of the first slot body 111 to accommodate the accessory box 15. When the item 2 is placed in the clamping space, the side walls of the item 2 and the first slot body 111 can abut against both sides of the accessory box 15 to clamp and limit the accessory box 15, thereby preventing the accessory box 15 from shaking in the first slot body 111.

[0067] Specifically, in some embodiments, Figure 2 As shown, a third rib 134 is protruding from the inner wall of the second trough body and the third trough body. The third rib 134 of the second trough body and the third trough body is used to abut against the same side of the article 2, and a first accommodating gap is formed between the third rib 134 of the second trough body and the third trough body.

[0068] In this embodiment, by providing a third rib 134 on the inner wall on the same side of the second trough body and the third trough body, on the one hand, the third rib 134 can serve as a reinforcing rib of the first paper support 13 and the second paper support 14 to strengthen the strength of the first paper support 13 and the second paper support 14, so that the first paper support 13 and the second paper support 14 are not easily deformed; on the other hand, the third rib 134 of the second trough body and the third trough body abuts against the same side of the article 2, so that a certain gap is left between the side of the article 2 and the side wall of the first trough body 111, thereby forming a first accommodating gap for accommodating the accessory box 15.

[0069] Optionally, in some embodiments, Figure 2and Figure 6 As shown, the packaging box also includes a mask protection bag 16; a second accommodating gap is provided between the clamping space and an inner wall of one side of the first slot body 111; and the mask protection bag 16 is arranged in the second accommodating gap.

[0070] In this embodiment, a mask protection bag 16 is provided to accommodate the mask of the article 2 to prevent the mask from being scratched and damaged, and a second accommodating gap is left between the clamping space and the inner wall of one side of the first groove body 111 to accommodate the mask protection bag 16. When the article 2 is placed in the clamping space, the side walls of the article 2 and the first groove body 111 can abut against both sides of the mask protection bag 16 to clamp and limit the mask protection bag 16 to prevent the mask protection bag 16 from shaking in the first groove body 111. The structure is simple, convenient and practical.

[0071] Optionally, the mask protection bag 16 can be a paper bag.

[0072] Specifically, the second accommodating gap may be located at the top or bottom of the object 2 , and the first accommodating gap may be located at one side of the object 2 .

[0073] In some embodiments, Figure 3 As shown, the box cover 12 and the box body 11 are an integral structure, and the box cover 12 can be folded and installed on the box body 11.

[0074] In this embodiment, the box cover 12 and the box body 11 are integrally formed to make the connection between the box cover 12 and the box body 11 more secure, and facilitate the production of the box cover 12 and the box body 11. The box cover 12 can be folded to cover or open the opening of the first slot 111 of the box body 11, with a simple structure and convenient operation.

[0075] Optionally, in some embodiments, there are multiple box covers 12, and the multiple box covers 12 are arranged along the opening edges of the first slot body 111. When the multiple box covers 12 are folded toward the opening of the first slot body 111, the edges of the multiple box covers 12 can abut against or partially overlap each other to cover and close the opening of the first slot body 111.

[0076] Optionally, in some embodiments, a fifth slot is provided at the bottom of the box cover 12, the shape of the fifth slot matches the box body 11, the box body 11 is inserted into the fifth slot, and the opening of the first slot 111 of the box body 11 faces the bottom of the fifth slot.

[0077] Optionally, the box body 11 can use one of a super-strong paper box, a white card EB corrugated paper box, and a black card EB corrugated paper box; the box cover 12 can use one of a super-strong paper cover, a white card EB corrugated paper cover, and a black card EB corrugated paper cover.

[0078] Alternatively, if Figure 3 and Figure 4As shown, the box cover 12 includes a first part 121 and a second part 122; the first part 121 is foldably connected to the box body 11, and the first part 121 can be folded to cover or away from the opening; the second part 122 includes a fitting portion 123 and an inserting portion 124, the fitting portion 123 is foldably connected to the first part 121, and the inserting portion 124 is arranged at both ends of the fitting portion 123, and an inserting groove 112 is provided on the box body 11 corresponding to the inserting portion 124; when the first part 121 covers the opening, the fitting portion 123 can be folded to fit with the side wall of the box body 11, so that the inserting portion 124 is inserted into the inserting groove 112.

[0079] In this embodiment, the box cover 12 is provided with a first part 121 and a second part 122, wherein the first part 121 is adapted to the opening shape of the first slot body 111, and the first part 121 can be folded on the box body 11 to close the opening or to move away from the opening; when the first part 121 covers the opening, the fitting part 123 of the second part 122 can be folded on the first part 121, so that the fitting part 123 is close to and fits the side wall of the box body 11, and the plug-in parts 124 at both ends of the fitting part 123 are inserted into the plug-in grooves 112 on the box body 11, so as to lock the first part 121 and keep the first slot body 111 closed. The structure is simple, convenient and practical.

[0080] The above described embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiments. Those skilled in the art may understand and implement the embodiments without creative effort.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A packaging box, characterized in that: include: A box body (11) and a box cover (12), wherein the box body (11) is provided with a first slot body (111) with at least one side opening, and the box cover (12) can be opened and closed at the opening of the first slot body (111); A first paper holder (13) and a second paper holder (14) are arranged opposite to each other. The first paper holder (13) and the second paper holder (14) are arranged on the first groove body (111). The sides of the first paper holder (13) and the second paper holder (14) facing away from each other are respectively in contact with the inner wall of the first groove body (111). The second groove body and the third groove body are arranged on opposite sides of the first paper holder (13) and the second paper holder (14). The second groove body and the third groove body are arranged to form a clamping space for clamping and fixing articles.

2. The packaging box according to claim 1, characterized in that: First convex ribs (131) are convexly provided on the inner walls on opposite sides of the second trough body and / or the third trough body, and the first convex ribs (131) are used to abut against opposite sides of the article (2).

3. The packaging box according to claim 1, characterized in that: A second convex rib (132) is protruded from one side of the first paper holder (13) and / or the second paper holder (14) facing the inner wall of the first trough body (111), and the second convex rib (132) abuts against the inner wall of the first trough body (111); Alternatively, a protrusion (133) is provided on one side of the first paper holder (13) and / or the second paper holder (14) facing the inner wall of the first trough body (111), and the protrusion (133) abuts against the inner wall of the first trough body (111).

4. The packaging box according to claim 1, characterized in that: A fourth slot body is provided on one side of the first paper holder (13) and / or the second paper holder (14) facing the inner wall of the first slot body (111).

5. The packaging box according to claim 4, characterized in that: There are a plurality of the fourth slot bodies, and the plurality of the fourth slot bodies are arranged at intervals.

6. The packaging box according to claim 1, characterized in that: Also includes an accessory box (15); A first accommodating gap is provided between the clamping space and an inner wall of one side of the first groove body (111); and the accessory box (15) is arranged in the first accommodating gap.

7. The packaging box according to claim 6, characterized in that: The inner walls of the second trough body and the third trough body are both provided with a third convex rib (134), and the third convex rib (134) of the second trough body and the third trough body are used to abut against the same side of the article (2); The first accommodation gap is formed between the second groove body and the third rib (134) of the third groove body.

8. The packaging box according to claim 6, characterized in that: Also included is a mask protection bag (16); A second accommodating gap is provided between the clamping space and an inner wall of one side of the first groove body (111); and the mask protection bag (16) is arranged in the second accommodating gap.

9. The packaging box according to claim 1, characterized in that: The box cover (12) and the box body (11) are an integral structure, and the box cover (12) can be folded and installed on the box body (11).

10. The packaging box according to claim 9, characterized in that: The box cover (12) comprises a first part (121) and a second part (122); The first part (121) is connected to the box body (11) in a foldable manner, and the first part (121) can be folded to cover or stay away from the opening; The second part (122) comprises a fitting part (123) and an inserting part (124), the fitting part (123) is foldably connected to the first part (121), the inserting part (124) is arranged at two ends of the fitting part (123), and an inserting groove (112) is arranged on the box body (11) corresponding to the inserting part (124); When the first part (121) covers the opening, the fitting portion (123) can be folded to fit with the side wall of the box body (11), so that the plug-in portion (124) is inserted into the plug-in slot (112).

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