A packaging box and a cover plate engaging structure of a split packaging profile thereof

Abstract

The utility model relates to packing box technical field more specifically relates to a kind of packing box and the cover plate clamping structure of split type packing section bar thereof.The packing box includes box section bar and cover plate section bar being covered on the box section bar, and the box section bar includes integrally formed packing box side panel, and the cover plate section bar is covered on the top of the packing box side panel;The cover plate clamping structure includes support assembly and clamping assembly;Support assembly is formed by transverse rib and longitudinal rib first rectangular structure on the inner surface of cover plate section bar, and its size is matched with the inner diameter of box section bar, ensure that cover plate section bar can stably support box section bar;Clamping assembly is used to realize the clamping of cover plate section bar and box section bar.The utility model provides a kind of packing box and the cover plate clamping structure of split type packing section bar thereof, and the structure is simple, clamping is stable, and its split type packing section bar can be stacked when not assembled, and the space occupied is small.

Description

Technical Field

[0001] This utility model relates to the field of packaging box technology, and more specifically to a packaging box and its split packaging profile cover locking structure. Background Technology

[0002] Packaging boxes made by foaming and molding plant fibers have the advantages of being virtually environmentally friendly, having a simple manufacturing process, low cost, wide availability of raw materials, and excellent shock absorption and vibration isolation performance.

[0003] The packaging boxes are made from plant fibers and additives such as starch. Preparation methods include those disclosed in patent document CN 101377395 B, "Molded Firework Outer Cylinder, Firework Ball Shell and its Manufacturing Method"; and patent document CN 101337374 B, "A Manufacturing Method of Pure Plant Fiber Expanded Foamed Packaging Material," etc. When manufacturing the profiles, only the mold shape needs to be adjusted as required.

[0004] Packaging boxes, as a common type of packaging container, are widely used in the storage and transportation of food, electronic products, gifts, fragile items, and other daily necessities. Traditional packaging boxes typically consist of two parts: the box body and the lid. The lid is placed on top of the box body to seal the internal space of the box.

[0005] However, traditional packaging boxes use various methods to connect the lid to the box body, such as using tongues, magnets, adhesives, or simple overlapping structures to achieve closure. In actual use, these methods can easily cause the lid to loosen or fall off the box body during transportation or handling, thus affecting the sealing and safety of the packaging box. At the same time, because the lid is not easily engaged with the box body, it can easily cause wear and tear on the packaging box, shortening its service life.

[0006] Therefore, it is urgent to propose a new technical solution to address the problem. Utility Model Content

[0007] (a) Technical problems to be solved Based on this, the present invention provides a cover plate locking structure for a packaging box and its split packaging profile, which has a simple structure, stable locking, and effectively ensures the sealing and safety of the packaging box.

[0008] (II) Technical Solution To solve the above-mentioned technical problems, this utility model provides a cover plate locking structure for a packaging box and its split packaging profile. The cover plate locking structure includes a locking component and a supporting component disposed on the inner surface of the cover plate profile. The supporting component includes transverse ribs and longitudinal ribs disposed on the inner surface of the cover plate profile. The transverse ribs include two outer transverse ribs extending in the transverse direction and arranged in parallel. The longitudinal ribs include two outer longitudinal ribs extending in the longitudinal direction and arranged in parallel. The two outer transverse ribs and the two outer longitudinal ribs surround each other on the inner surface of the cover plate profile to form a first rectangular structure. The maximum spacing between the two outer transverse ribs in the longitudinal direction matches the inner diameter of the box profile in the longitudinal direction. The two outer longitudinal ribs... The maximum spacing in the lateral direction matches the inner diameter of the box profile in the lateral direction; the locking assembly includes a first locking structure disposed on the lateral side of the cover profile in the lateral direction and a second locking structure disposed on the longitudinal side of the cover profile in the longitudinal direction; the box profile includes a first side plate extending in the lateral direction and a second side plate extending in the longitudinal direction, the first top edge of the first side plate is provided with a third locking structure that cooperates with the first locking structure, the second top edge of the second side plate is provided with a fourth locking structure that cooperates with the second locking structure, the first locking structure and the second locking structure are spliced ​​together with the third locking structure and the fourth locking structure so that the cover profile can lock and support the side panel of the packaging box.

[0009] Preferably, the first engaging structure includes at least two first hook portions, the second engaging structure includes at least two second hook portions, the third engaging structure includes at least two first edge portions, and the fourth engaging structure includes at least two second edge portions; the first hook portions and the second hook portions engage with the first edge portions and the second edge portions.

[0010] Preferably, the first hook portion includes a strip-shaped first protrusion extending from the inner surface of the cover plate profile and toward one side of the box profile. The first protrusion extends along the transverse direction and is coplanar with the outer surface of the transverse edge of the cover plate profile. A first engaging gap is formed between the first protrusion and the outer transverse rib. The second hook portion includes a strip-shaped second protrusion extending from the inner surface of the cover plate profile and toward one side of the box profile. The second protrusion extends along the longitudinal direction and is coplanar with the outer surface of the longitudinal edge of the cover plate profile. A first engaging gap is formed between the second protrusion and the outer transverse rib. A second engaging gap is formed between the external longitudinal ribs; a first stepped groove that mates with the first protrusion is provided on the outer side surface of the first top edge of the first side plate, and a first engaging edge is formed between the first stepped groove and the inner surface of the first top edge; the thickness of the first engaging edge matches the first engaging gap; a second stepped groove that mates with the second protrusion is provided on the outer side surface of the second top edge of the second side plate, and a second engaging edge is formed between the second stepped groove and the inner surface of the second top edge; the thickness of the second engaging edge matches the second engaging gap.

[0011] Preferably, the depth of the first stepped groove is the same as the height of the first protrusion, and the length of the first stepped groove is the same as the length of the first protrusion; the depth of the second stepped groove is the same as the height of the second protrusion, and the length of the second stepped groove is the same as the length of the second protrusion.

[0012] Preferably, the cover plate profile has a first hook portion at both ends of its horizontal side and a second hook portion at both ends of its vertical side. The first hook portion and the second hook portion at the corner of the cover plate profile together form an L-shaped hook.

[0013] Preferably, at least one first hook portion is provided between the two ends of the transverse side of the cover plate profile.

[0014] Preferably, the first protrusions on the transverse sides are continuous, the second protrusions on the longitudinal sides are continuous, and the two first protrusions and the two second protrusions surround each other to form a second rectangular structure on the inner surface of the cover plate profile.

[0015] Preferably, the transverse reinforcement further includes a central transverse reinforcement disposed between the two outer transverse reinforcements, and the longitudinal reinforcement further includes a central longitudinal reinforcement disposed between the two outer longitudinal reinforcements.

[0016] Preferably, the box profile also includes a bottom plate integrally formed with the first side plate and the second side plate, the top edge of the bottom plate being integrally formed with the bottom edge of the first side plate and the second side plate respectively; a plurality of first reinforcing ribs are provided at equal intervals on the inner side wall of the first side plate, and a plurality of second reinforcing ribs are provided at equal intervals on the inner side wall of the second side plate.

[0017] In a second aspect, this utility model provides a packaging box, the packaging box comprising a box body profile and a cover plate profile, the cover plate profile being engaged with the top of the box body profile by a cover plate engaging structure, and supporting the box body profile to form the packaging box.

[0018] (III) Beneficial Effects Compared with the prior art, the present invention has at least the following technical effects: 1. The cover plate locking structure provided by this utility model, through the synergistic effect of the support component and the locking component, enables the cover plate profile to be tightly locked and support the box profile, effectively preventing the cover plate profile from loosening or falling off during transportation or handling.

[0019] 2. The support components provided by the cover plate locking structure of this utility model, through the rectangular structure formed by the transverse and longitudinal ribs, match the inner diameter of the box profile, thereby enhancing the fit between the cover plate profile and the box profile and improving the sealing and safety of the packaging box.

[0020] 3. The locking assembly provided by the cover plate locking structure of this utility model, by setting a first locking structure and a second locking structure on the inner surface of the cover plate profile, and then setting a third locking structure and a fourth locking structure on the box profile to cooperate with the first locking structure and the second locking structure, the first locking structure and the third locking structure are spliced ​​and locked, and the second locking structure and the fourth locking structure are spliced ​​and locked, which ensures a stable connection between the cover plate profile and the box profile, reduces wear between the cover plate profile and the box profile, and extends the service life of the packaging box.

[0021] 4. The packaging box provided by this utility model has a split packaging profile that can be stacked and stored without assembly, and occupies little space. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a structural schematic diagram of a packaging box provided by this utility model; Figure 2 This is a schematic diagram of another embodiment of the packaging box provided by this utility model; Figure 3 yes Figure 1 Structural diagram of the box body profile and cover plate profile provided by the packaging box; Figure 4 yes Figure 2 Structural diagram of the box body profile and cover plate profile provided by the packaging box; Figure 5 yes Figure 3 A schematic diagram of the cover plate engaging structure provided by the cover plate profile; Figure 6 yes Figure 4 A schematic diagram of the cover plate engaging structure provided by the cover plate profile; Figure 7 yes Figure 3 A structural diagram of the side panel of the packaging box provided by the medium packaging box; Figure 8 yes Figure 4 A structural diagram of the side panel of the packaging box provided by the intermediate packaging box; Figure 9 yes Figure 7 A magnified view of a section at point A in the middle; Figure 10 yes Figure 8 A magnified view of a section at point B in the middle.

[0023] Explanation of the labels for the main components in the diagram: 100. Packaging boxes; 10. Supporting components; 11. Transverse ribs; 12. Longitudinal ribs; 20. Engaging assembly; 21. First engaging structure; 211. First hook portion; 2111. First protrusion; 2112. First engaging gap; 22. Second engaging structure; 221. Second hook portion; 2211. Second protrusion; 2212. Second engaging gap; 30. Box-shaped profile; 31. First side panel; 311. First top edge; 312. Third locking structure; 3121. First locking edge; 3122. First stepped groove; 313. First reinforcing rib; 32. Second side panel; 321. Second top edge; 322. Fourth locking structure; 3221. Second locking edge; 3222. Second stepped groove; 323. Second reinforcing rib; 40. Cover plate profile; 41. Horizontal edge; 42. Longitudinal edge. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings; many specific details are set forth in the following description in order to provide a full understanding of this utility model; based on the embodiments of this utility model, those skilled in the art can make similar improvements without departing from the spirit of this utility model, but cannot make all other embodiments obtained without creative effort, therefore this utility model is not limited to the specific embodiments disclosed below.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can also refer to a "transmission connection," that is, a power connection through various suitable methods such as belt drive, gear drive, or sprocket drive. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Please see Figures 1 to 10 To address the problem of unstable engagement of the cover plate on the box body, which affects the sealing and safety of the box, this utility model provides a cover plate engagement structure (not shown in the figure) for a box 100 and its split packaging profile. The box 100 includes a box body profile 30 and a cover plate profile 40 covering the box body profile 30. The box body profile 30 includes an integrally formed box side panel (not shown in the figure), and the cover plate profile 40 covers the top of the box side panel. The cover plate engagement structure is provided on the inner surface of the cover plate profile 40.

[0027] The cover plate engaging structure includes a support component 10 and an engaging component 20; wherein, The support assembly 10 includes transverse ribs 11 and longitudinal ribs 12 disposed on the inner surface of the cover plate profile 40. The transverse ribs 11 include two external transverse ribs (not shown) that extend in the transverse direction and are arranged in parallel. The longitudinal ribs 12 include two external longitudinal ribs (not shown) that extend in the longitudinal direction and are arranged in parallel. The two external transverse ribs and the two external longitudinal ribs surround each other on the inner surface of the cover plate profile 40 to form a first rectangular structure (not shown). The maximum spacing between the two external transverse ribs in the longitudinal direction matches the inner diameter of the box profile 40 in the longitudinal direction. The maximum spacing between the two external longitudinal ribs in the transverse direction matches the inner diameter of the box profile 30 in the transverse direction.

[0028] The support component 10 provided by this utility model forms a first rectangular structure on the inner surface of the cover plate profile 40 through transverse ribs 11 and longitudinal ribs 12. The size of the first rectangular structure matches the inner diameter of the box profile 30, thereby ensuring that the cover plate profile 40 can stably support the inner side wall of the box profile 30, and thus making the box profile 30 less prone to bending and deformation.

[0029] The engaging assembly 20 includes a first engaging structure 21 disposed on the transverse side 41 of the cover plate profile 40 in the transverse direction and a second engaging structure 22 disposed on the longitudinal side 42 of the cover plate profile 40 in the longitudinal direction. The box profile 30 includes a first side plate 31 extending in the transverse direction and a second side plate 32 extending in the longitudinal direction. The first top edge 311 of the first side plate 31 is provided with a third engaging structure 312 that cooperates with the first engaging structure 21. The second top edge 321 of the second side plate 32 is provided with a fourth engaging structure 322 that cooperates with the second engaging structure 22. The first engaging structure 21 and the second engaging structure 22 are spliced ​​together with the third engaging structure 312 and the fourth engaging structure 322 so that the cover profile 40 can engage and support the side panel of the packaging box.

[0030] The locking assembly 20 provided by this utility model includes a first locking structure 21 and a second locking structure 22, which are respectively spliced ​​with the third locking structure 312 and the fourth locking structure 322 on the box profile 30 to realize the locking of the cover plate profile 40 and the box profile 30.

[0031] It is understood that the term "integrated molding" in this embodiment can refer to a plastic structure integrally molded by injection molding; a material integrally molded by casting; or a structure integrally molded after curing a foamed material.

[0032] Preferably, in this embodiment, the structure can be integrally formed by thermoforming and curing organic fibers and starch-based adhesives, supplemented with inorganic fillers, release agents and other materials.

[0033] In one embodiment, the first engaging structure 21 includes at least two first hook portions 211, the second engaging structure 22 includes at least two second hook portions 221, the third engaging structure 312 includes at least two first edge portions 3121, and the fourth engaging structure 322 includes at least two second edge portions 3221. The first hook portions 211 and the second hook portions 221 engage with the first edge portions 3121 and the second edge portions 3221 to achieve a stable connection between the cover plate profile 40 and the box profile 30.

[0034] In one embodiment, the first latch 211 includes a strip-shaped first protrusion 2111 that protrudes from the inner surface of the cover profile 40 and extends toward the box profile 30. The first protrusion 2111 extends in the transverse direction and is coplanar with the outer surface of the transverse edge 41 of the cover profile 40. A first engagement gap 2112 is formed between the first protrusion 2111 and the outer transverse rib. A first stepped groove 3122 that mates with the first protrusion 2111 is provided on the outer side surface of the first top edge 311 of the first side plate 31. A first latching edge 3121 is formed between the first stepped groove 3122 and the inner surface of the first top edge 311. The thickness of the first latching edge 3121 matches the first engagement gap 2112, so that the first engagement structure 21 on the transverse edge 41 of the cover profile 40 can be stably engaged in the third engagement structure 312 on the first top edge 311.

[0035] Furthermore, the second hook portion 221 includes a strip-shaped second protrusion 2211 that protrudes from the inner surface of the cover plate profile 40 and extends toward the box profile 30. The second protrusion 2211 extends in the longitudinal direction and is coplanar with the outer surface of the longitudinal edge 42 of the cover plate profile 40. A second engagement gap 2212 is formed between the second protrusion 2211 and the outer longitudinal rib. A second stepped groove 3222 that cooperates with the second protrusion 2211 is provided on the outer side surface of the second top edge 321 of the second side plate 32. A second engagement edge portion 3221 is formed between the second stepped groove 3222 and the inner surface of the second top edge 321. The thickness of the second engagement edge portion 3221 matches the second engagement gap 2212, so that the second engagement structure 22 on the longitudinal edge 42 of the cover plate profile 40 can be stably engaged in the fourth engagement structure 322 on the second top edge 321.

[0036] Specifically, after the first locking structure 21 and the third locking structure 312 are spliced ​​and locked together, and the second locking structure 22 and the fourth locking structure 322 are spliced ​​and locked together, the outer surfaces of the cover plate profile 40 and the box body profile 30 are flush with each other, so that they can form a smooth packaging box 100 after assembly.

[0037] In one embodiment, the depth of the first stepped groove 3122 is the same as the height of the first protrusion 2111, and the length of the first stepped groove 3122 is the same as the length of the first protrusion 2111; the depth of the second stepped groove 3222 is the same as the height of the second protrusion 2211, and the length of the second stepped groove 3222 is the same as the length of the second protrusion 2211, ensuring that the first protrusion 2111 and the first stepped groove 3122, and the second protrusion 2211 and the second stepped groove 3222 can fit together completely, effectively enhancing the tightness and stability of the engagement between the cover plate profile 40 and the box profile 30.

[0038] In one embodiment, a first hook portion 211 is provided at both ends of the transverse edge 41 of the cover plate profile 40, and a second hook portion 221 is provided at both ends of the longitudinal edge 42 of the cover plate profile 40. The first hook portion 211 and the second hook portion 221 at the corner of the cover plate profile 40 together form an L-shaped hook. The design of the L-shaped hook effectively enhances the locking strength of the cover plate profile 40 at the corner and prevents the cover plate profile 40 from warping.

[0039] Furthermore, at least one first hook portion 211 is provided between the two ends of the transverse side 41. The first hook portion 211 can be located in the middle of the transverse side 41 to provide an additional engagement point and further enhance the connection stability between the cover plate profile 40 and the box profile 30 in the transverse direction.

[0040] Generally speaking, in this embodiment, the horizontal side 41 is longer than the vertical side 42. For side panels with a length greater than a certain size, the connection stability between the cover plate profile 40 and the box body profile 30 in the horizontal direction can be enhanced by appropriately increasing the number of first hook portions 211.

[0041] In other embodiments, if the length of the transverse side 41 is small, the first hook portion 211 may not be provided between the two ends.

[0042] Preferably, in a preferred embodiment, when the longitudinal edge 42 reaches a preset length, at least one second hook portion 221 is provided between the two ends of the longitudinal edge 42. The second hook portion 221 can be located at the middle position of the longitudinal edge 42 to provide additional engagement points and further enhance the connection stability between the cover plate profile 40 and the box profile 30 in the longitudinal direction.

[0043] Generally speaking, if the length of the longitudinal edge 42 is small, the second hook part 221 may not be provided between the two ends.

[0044] In one embodiment, the first protrusions 2111 on the horizontal sides 41 are continuous, the second protrusions 2211 on the vertical sides 42 are continuous, and the two first protrusions 2111 and the two second protrusions 2211 surround each other on the inner surface of the cover plate profile 40 to form a second rectangular structure, so that the locking force is more evenly distributed when locked, thereby improving the reliability of the overall structure.

[0045] In one embodiment, the transverse rib 11 further includes a central transverse rib (not shown) disposed between two outer transverse ribs, and the longitudinal rib further includes a central longitudinal rib (not shown) disposed between two outer longitudinal ribs; the central transverse rib and the central longitudinal rib effectively enhance the rigidity of the support assembly 10, prevent the cover plate profile 40 from deforming, and better support the box profile 30.

[0046] In one embodiment, the box profile 30 further includes a bottom plate (not shown) integrally formed with the first side plate 31 and the second side plate 32, wherein the top edge of the bottom plate is integrally formed with the bottom edge of the first side plate 31 and the second side plate 32, respectively.

[0047] Furthermore, a plurality of first reinforcing ribs 313 are provided at equal intervals on the inner wall of the first side plate 31, and a plurality of second reinforcing ribs 323 are provided at equal intervals on the inner wall of the second side plate 32; the first reinforcing ribs 115 and the second reinforcing ribs 125 effectively improve the structural strength of the box profile 30, thereby enhancing the box profile 30's resistance to pressure and impact, thus preventing the packaging box 100 from deforming during transportation and extending the service life of the packaging box 100.

[0048] In one embodiment, the packaging box 100 includes a box body profile 30 and a cover profile 40. The cover profile 40 is engaged with the top of the box body profile 30 by a cover engagement structure and supports the box body profile 40 to form the packaging box 100. The cover engagement structure has a stable overall structure, simple structure, and stable engagement, which effectively ensures the sealing and safety of the packaging box 100.

[0049] Compared with the prior art, the present invention has at least the following technical effects: 1. The cover plate locking structure provided by this utility model, through the synergistic effect of the support component 10 and the locking component 20, enables the cover plate profile 40 to tightly lock and support the box body profile 30, effectively preventing the cover plate profile 40 from loosening or falling off during transportation or handling.

[0050] 2. The support component 10 provided by the cover plate engaging structure of this utility model, through the rectangular structure formed by the transverse ribs 11 and the longitudinal ribs 12, matches the inner diameter of the box profile 30, which enhances the fit between the cover plate profile 40 and the box profile 30, and improves the sealing and safety of the packaging box 100.

[0051] 3. The locking component 20 provided by the cover plate locking structure of this utility model provides a first locking structure 21 and a second locking structure 22 on the inner surface of the cover plate profile 30, and a third locking structure 312 and a fourth locking structure 322 that cooperate with the first locking structure 21 and the second locking structure 22 on the box profile 30. The first locking structure 21 and the third locking structure 312 are spliced ​​and locked, and the second locking structure 22 and the fourth locking structure 322 are spliced ​​and locked, which ensures a stable connection between the cover plate profile 40 and the box profile 30, reduces wear between the cover plate profile 40 and the box profile 30, and extends the service life of the packaging box 100.

[0052] 4. The packaging box 100 provided by this utility model has a split packaging profile that can be stacked and stored without assembly, and occupies little space.

[0053] Obviously, the above embodiments are merely examples for the detailed description of this utility model, and are not intended to limit the implementation. This utility model can be implemented in many other ways different from those described herein. Although the embodiments of this utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make other modifications and variations based on the above description, and such modifications and variations still fall within the protection scope defined by the appended claims.

Claims

1. A cover plate engaging structure for a packaging box, the packaging box comprising a box body profile and a cover plate profile disposed on the box body profile, the box body profile comprising an integrally formed packaging box side panel, the cover plate profile being disposed on the top of the packaging box side panel; characterized in that, The cover plate engaging structure is disposed on the inner surface of the cover plate profile, and the cover plate engaging structure includes: A support assembly includes transverse ribs and longitudinal ribs disposed on the inner surface of the cover plate profile. The transverse ribs include two outer transverse ribs extending in the transverse direction and arranged in parallel. The longitudinal ribs include two outer longitudinal ribs extending in the longitudinal direction and arranged in parallel. The two outer transverse ribs and the two outer longitudinal ribs surround each other on the inner surface of the cover plate profile to form a first rectangular structure. The maximum spacing between the two outer transverse ribs in the longitudinal direction matches the inner diameter of the box profile in the longitudinal direction. The maximum spacing between the two outer longitudinal ribs in the transverse direction matches the inner diameter of the box profile in the transverse direction. The engaging assembly includes a first engaging structure disposed on the transverse side of the cover plate profile along the transverse direction and a second engaging structure disposed on the longitudinal side of the cover plate profile along the longitudinal direction. The box profile includes a first side plate extending in the transverse direction and a second side plate extending in the longitudinal direction. The first top edge of the first side plate is provided with a third locking structure that cooperates with the first locking structure. The second top edge of the second side plate is provided with a fourth locking structure that cooperates with the second locking structure. The first locking structure and the second locking structure are spliced ​​together with the third locking structure and the fourth locking structure so that the cover profile can lock and support the side panel of the packaging box.

2. The cover plate engaging structure according to claim 1, characterized in that, The first engaging structure includes at least two first hook portions, the second engaging structure includes at least two second hook portions, the third engaging structure includes at least two first edge portions, and the fourth engaging structure includes at least two second edge portions; the first hook portions and the second hook portions engage with the first edge portions and the second edge portions.

3. The cover plate engaging structure according to claim 2, characterized in that, The first hook portion includes a strip-shaped first protrusion that protrudes from the inner surface of the cover plate profile and extends toward one side of the box profile. The first protrusion extends along the transverse direction and is coplanar with the outer surface of the transverse edge of the cover plate profile. A first engagement gap is formed between the first protrusion and the outer transverse rib. The second hook portion includes a strip-shaped second protrusion that protrudes from the inner surface of the cover plate profile and extends toward one side of the box profile. The second protrusion extends along the longitudinal direction and is coplanar with the outer surface of the longitudinal edge of the cover plate profile. A second engagement gap is formed between the second protrusion and the outer longitudinal rib. A first stepped groove is formed on the outer side surface of the first top edge of the first side plate to cooperate with the first protrusion, and the first locking edge is formed between the first stepped groove and the inner surface of the first top edge; the thickness of the first locking edge matches the first locking gap. A second stepped groove is provided on the outer side surface of the second top edge of the second side plate to cooperate with the second protrusion. The second stepped groove and the inner surface of the second top edge form the second locking edge. The thickness of the second locking edge matches the second locking gap.

4. The cover plate engaging structure according to claim 3, characterized in that, The depth of the first stepped groove is the same as the height of the first protrusion, and the length of the first stepped groove is the same as the length of the first protrusion; the depth of the second stepped groove is the same as the height of the second protrusion, and the length of the second stepped groove is the same as the length of the second protrusion.

5. The cover plate engaging structure according to claim 4, characterized in that, The cover plate profile has a first hook portion at both ends of its horizontal side and a second hook portion at both ends of its vertical side. The first hook portion and the second hook portion at the corner of the cover plate profile together form an L-shaped hook.

6. The cover plate engaging structure according to claim 5, characterized in that, At least one first hook portion is also provided between the two ends of the horizontal edge.

7. The cover plate engaging structure according to claim 6, characterized in that, The first protrusions on the horizontal sides are continuous, the second protrusions on the vertical sides are continuous, and the two first protrusions and the two second protrusions surround each other on the inner surface of the cover plate profile to form a second rectangular structure.

8. The cover plate engaging structure according to claim 1, characterized in that, The transverse reinforcement also includes a central transverse reinforcement disposed between the two outer transverse reinforcements, and the longitudinal reinforcement also includes a central longitudinal reinforcement disposed between the two outer longitudinal reinforcements.

9. The cover plate engaging structure according to claim 1, characterized in that, The box profile also includes a bottom plate integrally formed with the first side plate and the second side plate. The top edge of the bottom plate is integrally formed with the bottom edge of the first side plate and the second side plate respectively. The inner side wall of the first side plate is provided with a plurality of first reinforcing ribs at equal intervals, and the inner side wall of the second side plate is provided with second reinforcing ribs at equal intervals.

10. A packaging box, characterized in that, The packaging box includes a box body profile and a cover plate profile. The cover plate profile is engaged with the top of the box body profile by the cover plate engaging structure according to any one of claims 1 to 9, and supports the box body profile to form the packaging box.

Images