A packaging box

Abstract

The utility model discloses a kind of packaging boxes, comprising: upper cover and lower box, wedge-shaped block is provided on one end of upper cover, the other end of the upper cover is rotatably connected with the one end of the lower box, the other end of the lower box is provided with movable plate, the lock hole is provided on the movable plate corresponding the wedge-shaped block, the both ends of the movable plate are provided with paper spring, when the upper cover is closed on the lower box, press or release the paper spring to make the wedge-shaped block disengage or insert the lock hole. The utility model can firmly lock the packaging box by the cooperation of wedge-shaped block and lock hole and the effect of paper spring, effectively avoids the tripping phenomenon when transporting or bumping. At the same time, opening and closing is realized by pressing the side of the lower box with hole position, simple operation is needed, without forcibly pulling or picking up buckle, greatly improve user experience. And the lower box can provide more space for showing and taking and placing products after opening, break through the limitation of fixed space form after opening traditional packaging box, increase practicality.

Description

Technical Field

[0001] This utility model relates to the field of packaging box technology, and in particular to a packaging box. Background Technology

[0002] Corrugated cardboard, due to its significant advantages of being lightweight, environmentally friendly, inexpensive, and easy to process, has been widely used in the field of product packaging, covering product packaging scenarios in multiple industries such as food, daily chemicals, and electronics. Among them, corrugated cardboard boxes with flip-tops are a type of structure that is used very frequently. They are usually formed into one piece by folding a single sheet of corrugated cardboard, and are divided into two interconnected parts: an upper flap and a lower box. The box is opened and closed by folding the upper flap relative to the lower box. The operation is basic and convenient, and can meet the basic packaging needs of most products.

[0003] During the transportation, storage, and circulation of goods, the reliability of the packaging box's closure is directly related to the safety of the internal contents. If the closure fails, it can easily lead to product damage, contamination, or loss. Therefore, corrugated cardboard packaging boxes with flip-tops generally need to be designed with a special locking structure to ensure that the top cover and bottom box can be stably closed when not in use.

[0004] Currently, corrugated cardboard boxes with flip-tops on the market exhibit a variety of sealing methods and opening / closing designs. Among them, two mainstream design methods are the most widely used, but both have obvious technical defects and cannot simultaneously meet the requirements of reliability, convenience, and environmental protection.

[0005] The first mainstream design method achieves locking through the combination of snap-fits and holes. The specific structure is as follows: a protruding snap-fit ​​(sometimes called a male snap-fit ​​or tongue in the industry) is set at the edge of the upper cover, while a matching hole or groove (sometimes called a female snap-fit ​​or locking hole in the industry) is machined at the corresponding edge of the lower box. When the upper cover is folded down, the snap-fit ​​inserts into the hole or locks into the groove, achieving a mechanical lock between the upper cover and the lower box. While this structure can achieve locking to a certain extent, it has revealed several technical shortcomings in practical applications:

[0006] Insufficient locking reliability: The locking effect of traditional buckle and hole structures relies on the interference fit or simple hook between the buckle and the hole, lacking a continuous and stable locking force. In scenarios such as bumps and vibrations during transportation, accidental collisions during storage and stacking, or minor drops during circulation, the buckle can easily loosen and pop out of the hole (commonly known in the industry as buckle detachment), causing the packaging box to open unexpectedly and failing to provide reliable security for the internal contents. This can cause direct economic losses, especially for fragile or easily damaged products.

[0007] Inconvenient opening and closing operation leads to a poor user experience: When opening the packaging box, the connection between the buckles and the holes is mostly rigid, requiring users to forcibly pry open the top edge or use their fingernails or tools. This process is not only physically demanding but also cumbersome. Furthermore, frequent forceful operations can damage the cardboard structure, causing the buckles to deform or break, or tearing the cardboard around the holes. For display packaging (such as sample display boxes on supermarket shelves) and everyday packaging (such as household storage boxes) that require repeated opening and closing, durability faces a serious challenge, and they may become unusable due to structural damage within a short period.

[0008] Limited Functionality: Existing corrugated cardboard boxes with flip-top lids using snap-fit ​​and perforated structures have a core function limited to opening and locking the top lid and bottom box, resulting in a single functional dimension. Once the top lid is open, the space of the bottom box remains fixed and cannot be adjusted according to actual usage needs. For scenarios where the details of the internal products (such as cosmetics, fine stationery, etc.) need to be fully displayed when open, the fixed space makes it difficult to highlight the product's selling points. Furthermore, for items that are large or deeply placed, the fixed space can be inconvenient for users to retrieve or place items, indicating significant deficiencies in space utilization and ease of use.

[0009] The second mainstream design method uses tape sealing, which involves applying tape to the seam between the flap and the lower box, using the tape's adhesive properties to close the packaging box. While this method can guarantee a certain degree of airtightness in the initial state, it also has many problems in practical use:

[0010] Cost and environmental issues: The sealing process consumes a large amount of tape, and the main components of tape are mostly plastic base material and adhesive layer. This not only directly increases the cost of packaging materials, but also the plastic material is difficult to degrade, and large-scale use will put continuous pressure on the environment. In the e-commerce industry and other fields with large parcel turnover, the amount of packaging waste generated daily due to tape use is huge, and the environmental problem is particularly prominent.

[0011] Ease of use and safety issues: When opening the box, scissors, utility knives or other knives must be used to cut the tape, which is a cumbersome and inefficient process. At the same time, if the knife is not operated properly during the tape cutting process, it may scratch the packaging of the items inside the box or even damage the items themselves, posing a safety hazard.

[0012] Poor reusability: For packaging boxes that need to be opened and closed multiple times, the adhesive strength of the tape will decrease rapidly during repeated pasting and tearing, making it impossible to maintain a continuous closure and seal. After multiple operations, the tape is prone to breakage and residual adhesive residue, which not only affects the appearance of the packaging box but also causes it to completely lose its sealing ability, making it difficult to maintain a good packaging effect. Utility Model Content

[0013] The purpose of this utility model is to provide a packaging box that solves the problems of insufficient locking reliability, inconvenient opening and closing operation, limited functionality and high packaging cost of existing corrugated paper flip packaging boxes.

[0014] This utility model provides a packaging box, including: an upper cover and a lower box. A wedge-shaped block is provided on one end of the upper cover, and the other end of the upper cover is rotatably connected to one end of the lower box. A movable plate is provided on the other end of the lower box. A locking hole is provided on the movable plate corresponding to the wedge-shaped block. Paper springs are provided at both ends of the movable plate. When the upper cover is closed onto the lower box, the paper springs are pressed or released to cause the wedge-shaped block to disengage from or insert into the locking hole.

[0015] Furthermore, the upper cover includes a closing part and a limiting part, the closing part and the limiting part are fixedly connected, the closing part is rotatably connected to one end of the lower box, and the wedge block is disposed on the limiting part. When the upper cover is closed onto the lower box, the limiting part is used to restrict the movable plate from moving outward.

[0016] Furthermore, the wedge-shaped block is provided with a locking part, which abuts against the inner wall of the lock hole to limit the closing of the upper cover.

[0017] Furthermore, the wedge-shaped block is provided with a ramp portion, one end of which is connected to the upper cover, and the other end of which is connected to the locking portion to support the locking portion.

[0018] Furthermore, the lower box includes a lower box body, the two ends of which are connected to the two ends of the movable plate by at least one paper spring.

[0019] Furthermore, the paper spring includes: an outer paper spring plate and an inner paper spring plate, one side of the outer paper spring plate is connected to the lower box body, the other side of the outer paper spring plate is connected to one side of the inner paper spring plate, and the other side of the inner paper spring plate is connected to the movable plate.

[0020] Furthermore, the connection between the outer side plate and the inner side plate of the paper spring has a spring-back structure.

[0021] Furthermore, the lower box also includes a reinforcing plate, which is attached to the movable plate.

[0022] Furthermore, a folding plate is provided on the reinforcing plate at the position corresponding to the key hole, and the folding plate is used to cover the empty part of the key hole.

[0023] Furthermore, the packaging box is made by folding a single sheet of corrugated cardboard.

[0024] This utility model discloses a packaging box, including an upper cover and a lower box. A wedge-shaped block is provided on one end of the upper cover, and the other end of the upper cover is rotatably connected to one end of the lower box. A movable plate is provided on the other end of the lower box, and a locking hole is provided on the movable plate corresponding to the wedge-shaped block. Paper springs are provided at both ends of the movable plate. When the upper cover is closed onto the lower box, the paper springs are pressed or released to allow the wedge-shaped block to disengage from or insert into the locking hole. This utility model, through the cooperation of the wedge-shaped block and the locking hole, and the action of the paper springs, can firmly lock the packaging box, effectively preventing the box from coming undone during transportation or impact. Simultaneously, opening and closing is achieved by pressing the side of the lower box with the hole, making operation simple and eliminating the need for forcibly prying or disengaging the latches, significantly improving the user experience. Furthermore, the lower box provides more space for displaying and retrieving products after opening, breaking through the limitations of the fixed spatial form of traditional packaging boxes after opening, increasing practicality. In addition, the elimination of non-paper auxiliary components reduces costs, decreases assembly steps, and facilitates recycling. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A structural diagram of the packaging box from a first-person perspective;

[0027] Figure 2 A structural diagram of the packaging box from a second-view perspective;

[0028] Figure 3 A structural diagram showing the packaging box in preparation for closing.

[0029] Figure 4 This is a schematic diagram of the packaging box when it is partially closed.

[0030] Figure 5 This is a schematic diagram of the packaging box when it is fully closed.

[0031] Figure 6 A perspective view of the packaging box when it is fully closed;

[0032] Figure 7 This is a schematic diagram of the packaging box when it is fully unfolded.

[0033] Explanation of the labels in the diagram:

[0034] 1. Top cover; 2. Lower box; 3. Wedge block; 4. Movable plate; 5. Locking hole; 6. Paper spring; 7. Cover part; 8. Limiting part; 9. Locking part; 10. Slope part; 11. Lower box body; 12. Outer plate of paper spring; 13. Inner plate of paper spring; 14. Reinforcing plate; 15. Folding plate. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0039] Please see Figure 1 and Figure 2 This embodiment provides a packaging box, including: an upper cover 1 and a lower box 2. A wedge block 3 is provided on one end of the upper cover 1, and the other end of the upper cover 1 is rotatably connected to one end of the lower box 2. A movable plate 4 is provided on the other end of the lower box 2. A locking hole 5 is provided on the movable plate 4 corresponding to the wedge block 3. Paper springs 6 are provided at both ends of the movable plate 4. When the upper cover 1 is closed on the lower box 2, the paper springs 6 are pressed or released so that the wedge block 3 disengages from or inserts into the locking hole 5.

[0040] This embodiment utilizes the cooperation of the wedge block 3 and the locking hole 5, along with the action of the paper spring 6, to firmly lock the packaging box, effectively preventing it from coming undone during transportation or impacts. Simultaneously, opening and closing is achieved by pressing the side of the lower box 2 with the hole, making operation simple and eliminating the need to forcibly pry open the latches, significantly improving the user experience. Furthermore, after opening, the lower box 2 provides more space for displaying and retrieving products, overcoming the limitations of the fixed spatial shape of traditional packaging boxes and increasing practicality. In addition, the elimination of non-paper auxiliary components reduces costs, decreases assembly steps, and facilitates recycling.

[0041] Specifically, paper springs 6 are provided at both ends of the movable plate 4, and the paper springs 6 are used to provide elastic restoring force. Please refer to [link / reference]. Figure 3-6 When the upper cover 1 is closed onto the lower box 2, the wedge block 3 slides into the locking hole 5 of the movable plate 4. At this time, the paper spring 6 is compressed to maintain a tight fit between the wedge block 3 and the locking hole 5. After the wedge block 3 is inserted into the locking hole 5, the paper spring 6 is released. Under the action of elastic restoring force, the paper spring 6 returns to its original shape and drives the movable plate 4 to rotate, so that the locking hole 5 of the lower box 2 firmly locks the wedge block 3 of the upper cover 1. If it is necessary to open the packaging box, the user presses the paper spring 6, causing it to elastically deform and release the wedge block 3. The wedge block 3 slides out of the locking hole 5, thereby realizing the separation of the upper cover 1 and the lower box 2. This structure replaces the traditional buckle or tape with the elastic action of the paper spring 6, realizing the automatic locking and unlocking function without external force assistance.

[0042] In this embodiment, please refer to Figure 1 The upper cover 1 includes a closing part 7 and a limiting part 8. The closing part 7 and the limiting part 8 are fixedly connected. The closing part 7 is rotatably connected to one end of the lower box 2. The wedge block 3 is disposed on the limiting part 8. When the upper cover 1 is closed onto the lower box 2, the limiting part 8 is used to restrict the movable plate 4 from moving outward.

[0043] The top cover 1 of the packaging box is specifically divided into a closing part 7 and a limiting part 8, which are fixed together by folding the same corrugated cardboard to form a structurally stable whole. The end of the closing part 7 away from the limiting part 8 is connected to the end of the lower box 2 by an integrally formed foldable structure, allowing the closing part 7 to rotate flexibly relative to the lower box 2, thereby enabling the entire top cover 1 to open and close. The wedge block 3 is integrally formed on the inner surface of the limiting part 8 facing the closing part 7 through a folding process, and the position of the wedge block 3 corresponds to the position of the locking hole 5 on the movable plate 4 of the lower box 2, ensuring that the wedge block 3 can be accurately inserted into the locking hole 5 when the top cover 1 is closed. When the upper cover 1 needs to be closed onto the lower box 2, first press the movable plate 4 of the lower box 2 to compress the paper spring 6, then rotate the closing part 7 to drive the limiting part 8 to move closer to the lower box 2 in sync, until the wedge block 3 slides into the locking hole 5 along the edge of the movable plate 4; at this time, release the pressure on the movable plate 4. Although the paper spring 6 has an elastic force to push the movable plate 4 outward, the limiting part 8 will abut against the outer surface of the movable plate 4. The structural strength of the limiting part 8 itself restricts the movable plate 4 from moving outward, preventing the movable plate 4 from moving outward too much due to the rebound force of the paper spring 6, which would cause the wedge block 3 to loosen from the locking hole 5, thereby ensuring the locking stability of the upper cover 1 and the lower box 2 after they are closed.

[0044] Furthermore, the wedge block 3 is provided with a locking part 9 (such as...). Figure 1 As shown, the locking part 9 abuts against the inner wall of the lock hole 5 to limit the closing of the upper cover 1.

[0045] The wedge block 3 has a protruding locking part 9, which is a planar structure. Its size is adapted to the locking hole 5 on the movable plate 4 of the lower box 2, and it can form a tight abutment with the inner wall of the locking hole 5. When performing the closing operation, first press the movable plate 4 inward to compress the paper springs 6 at both ends, and then rotate the closing part 7 of the upper cover 1, which drives the limiting part 8 and the wedge block 3 to approach the movable plate 4. As the upper cover 1 continues to rotate, the wedge block 3 gradually embeds into the locking hole 5 until most of the locking part 9 enters the interior of the locking hole 5. At this time, the movable plate 4 is released, the paper spring 6 restores its elastic deformation and pushes the movable plate 4 outward, so that the inner wall of the locking hole 5 is tightly attached to the surface of the locking part 9. The locking part 9 and the inner wall of the locking hole 5 form a stable abutment and limit, effectively preventing the upper cover 1 from detaching from the lower box 2, and finally achieving a reliable closing of the upper cover 1 and the lower box 2, avoiding accidental opening of the packaging due to loose locking during transportation or impact.

[0046] Furthermore, the wedge block 3 is provided with a ramp portion 10 (such as...). Figure 1 As shown, one end of the ramp portion 10 is connected to the upper cover 1, and the other end of the ramp portion 10 is connected to the locking portion 9 to support the locking portion 9.

[0047] The wedge block 3 has a ramp portion 10 that extends at an angle. One end of the ramp portion 10 is fixedly connected to the inner wall of the limiting portion 8 of the upper cover 1, and the other end is fixedly connected to the locking portion 9 on the wedge block 3, forming a stable support structure for the locking portion 9. When the upper cover 1 is closed, the lower box 2 movable plate 4 is pressed first to compress the paper spring 6. Then, the closing part 7 of the upper cover 1 is rotated, which drives the limiting part 8 and the wedge block 3 to move closer to the movable plate 4. At this time, the ramp part 10 of the wedge block 3 first contacts the edge of the movable plate 4. The ramp part 10 provides stable support for the locking part 9 by means of its connection structure with the upper cover 1 and the locking part 9, which prevents the locking part 9 from deforming or shifting during the sliding insertion into the lock hole 5. As the upper cover 1 continues to rotate, the ramp part 10 guides the locking part 9 to accurately align with the lock hole 5 on the lower box 2 movable plate 4 until the locking part 9 is inserted into the lock hole 5. Finally, under the action of the paper spring 6 pushing the movable plate 4, the locking part 9 abuts against the inner wall of the lock hole 5 and is limited, realizing the reliable closing of the upper cover 1 and the lower box 2. The ramp part 10 always supports the locking part 9 through the connection at both ends to ensure the stability of the locking structure.

[0048] In this embodiment, the lower box 2 includes: a lower box body 11 (e.g., ... Figure 1 As shown, the two ends of the lower box body 11 are connected to the two ends of the movable plate 4 by at least one paper spring 6.

[0049] The lower box 2 comprises a lower box body 11 and a movable plate 4. The lower box body 11 is the main structure for containing items, and it has side walls on both sides. The movable plate 4 is located at the opening of the lower box body 11, and is strip-shaped and adapted to the width of the lower box body 11. The two ends of the movable plate 4 are connected to the corresponding side walls of the lower box body 11 by at least one paper spring 6. The paper spring 6 is formed by folding the same corrugated paper, with one end fixedly connected to the inner side wall of the lower box body 11, and the other end fixedly connected to the end of the movable plate 4, forming a symmetrically distributed elastic support structure. When the movable plate 4 is pressed, the paper springs 6 at both ends are compressed simultaneously, and the movable plate 4 moves towards the interior of the lower box body 11. After the press is released, the paper springs 6 restore their elastic deformation, generating an outward thrust, which drives the movable plate 4 to reset away from the interior of the lower box body 11. Through this connection method, the paper springs 6 provide a continuous elastic force to the movable plate 4, ensuring that the locking hole 5 on the movable plate 4 and the wedge block 3 of the upper cover 1 form a stable fit and achieve reliable locking.

[0050] In some embodiments, the two ends of the lower box body 11 are connected to the two ends of the movable plate 4 by a plurality of paper springs 6.

[0051] Multiple paper springs 6 connect the inner sidewalls of both ends of the lower box body 11 to the two ends of the movable plate 4, with the number of paper springs 6 at both ends remaining symmetrical, for example, two paper springs 6 at each end. Each paper spring 6 is folded from the same corrugated paper (or multiple paper springs 6 are folded from the same corrugated paper), with one end fixed to the inner sidewall of the lower box body 11 and the other end fixed to the end of the movable plate 4. The multiple paper springs 6 release elastic potential energy together, applying a uniform and stable outward pushing force to the movable plate 4, ensuring that the movable plate 4 drives the locking hole 5 to fit tightly with the wedge block 3 of the upper cover 1, further improving the stability and durability of the locking structure.

[0052] Furthermore, the paper spring 6 includes: an outer paper spring plate 12 and an inner paper spring plate 13. One side of the outer paper spring plate 12 is connected to the lower box body 11, the other side of the outer paper spring plate 12 is connected to one side of the inner paper spring plate 13, and the other side of the inner paper spring plate 13 is connected to the movable plate 4.

[0053] The paper spring 6 consists of an outer paper spring plate 12 and an inner paper spring plate 13, which are folded from the same corrugated paper to form an integral structure. One side of the outer paper spring plate 12 is fixedly connected to the inner side wall of the lower box body 11, and the other side is connected to one side of the inner paper spring plate 13 through a crease formed by folding. The other side of the inner paper spring plate 13 is fixedly connected to the end of the movable plate 4, forming an elastically deformable paper spring 6 structure. When the movable plate 4 is pressed, the movable plate 4 drives the inner side plate 13 of the paper spring to move closer to the interior of the lower box body 11. The inner side plate 13 of the paper spring folds and deforms relative to the outer side plate 12 of the paper spring, so that the paper spring 6 is in a compressed state. After the press is released, the inner side plate 13 of the paper spring returns to its original position under the elasticity of the corrugated paper itself, and drives the outer side plate 12 of the paper spring to unfold synchronously, thereby pushing the movable plate 4 to move away from the interior of the lower box body 11. Through the coordinated deformation of the outer side plate 12 and the inner side plate 13 of the paper spring, a stable elastic force is provided for the movable plate 4, ensuring the cooperation effect between the locking hole 5 and the wedge block 3.

[0054] In some embodiments, the connection between the outer paper spring plate 12 and the inner paper spring plate 13 has a springback structure.

[0055] The paper spring 6 is composed of an outer paper spring plate 12 and an inner paper spring plate 13, which are formed by folding the same corrugated paper. At the connection between the outer paper spring plate 12 and the inner paper spring plate 13, there is a spring structure in the shape of a crease or a continuous crease. This spring structure utilizes the toughness of the corrugated paper itself and the structural characteristics after folding to have the ability to be repeatedly deformed and return to its original shape. One side of the outer side plate 12 of the paper spring is fixedly connected to the inner side wall of the lower box body 11, and the other side of the inner side plate 13 of the paper spring is fixedly connected to the end of the movable plate 4. When the movable plate 4 is pressed, the movable plate 4 drives the inner side plate 13 of the paper spring to move closer to the lower box body 11. At this time, the spring structure at the connection between the outer side plate 12 and the inner side plate of the paper spring is deformed by external force, converting the external force into elastic potential energy. After the press is released, the spring structure releases the elastic potential energy, drives the inner side plate 13 of the paper spring to reset away from the lower box body 11, and then pushes the movable plate 4 to reset synchronously, so that the locking hole 5 on the movable plate 4 and the wedge block 3 of the upper cover 1 maintain stable cooperation. Through the deformation and reset action of the spring structure, the paper spring 6 continuously provides reliable elastic support force for the movable plate 4, thereby ensuring the stability of the locking structure and the smoothness of the opening and closing operation.

[0056] In this embodiment, the lower box 2 further includes: a reinforcing plate 14 (such as...). Figure 2 As shown), the reinforcing plate 14 is attached to the movable plate 4.

[0057] The reinforcing plate 14, the movable plate 4, and the lower box body 11 are all integrally formed from the same corrugated cardboard through a folding process. The reinforcing plate 14 has a sheet-like structure that is adapted to the size of the movable plate 4. One side of its surface is completely attached to the inner side of the movable plate 4 near the interior of the lower box body 11, and it is fixedly connected to the movable plate 4 by folding and pressing, forming a double-layered reinforcing structure. When the user presses the movable plate 4 to open or close it, the reinforcing plate 14 can bear the force synchronously with the movable plate 4, and disperse the local stress generated by the press with its own structural strength, so as to prevent the movable plate 4 from deforming, collapsing or tearing due to repeated pressing. At the same time, the reinforcing plate 14 also enhances the overall rigidity of the movable plate 4 after being attached, so that the movable plate 4 maintains a stable shape under the elastic force of the paper spring 6, and ensures that the locking hole 5 on the movable plate 4 always maintains precise alignment with the wedge block 3 of the upper cover 1, further ensuring the reliability of the locking structure and the long-term durability of the movable plate 4.

[0058] Furthermore, a folding plate 15 is provided on the reinforcing plate 14 at the position corresponding to the lock hole 5. The folding plate 15 is used to cover the empty part of the lock hole 5.

[0059] At a position on the reinforcing plate 14 that corresponds exactly to the locking hole 5 of the movable plate 4, a folding plate 15 is integrally formed by folding the same corrugated paper. The folding plate 15 can be flexibly folded around the connecting edge with the reinforcing plate 14, and the size of the folding plate 15 is adapted to the overall diameter of the locking hole 5. When it is necessary to open the packaging box, after pressing the movable plate 4 to compress the paper spring 6 and completely disengage the wedge block 3 from the locking hole 5, the folding plate 15 remains folded towards the locking hole 5 due to its own folding toughness. At this time, the folding plate 15 can completely cover the entire locking hole 5, completely blocking the passage of external impurities into the lower box 2 through the locking hole 5. Regardless of whether the wedge block 3 is inserted into the locking hole 5, the folding plate 15 can effectively block the locking hole 5, which does not affect the cooperation between the locking hole 5 and the wedge block 3, and continuously ensures the cleanliness and dryness of the interior of the lower box 2.

[0060] Please see Figure 7 In this embodiment, the packaging box is made by folding a single sheet of corrugated cardboard.

[0061] The packaging box is made from a single piece of corrugated cardboard through folding and pressing processes, without the need for additional splicing or assembly of other materials. During the folding process, the corrugated paper is folded into sections according to the preset creases to form the upper cover 1 and the lower box 2 that cooperate with each other. The cover 7, the limiting part 8, and the wedge block 3 (including the ramp part 10 and the locking part 9) on the limiting part 8 of the upper cover 1 are all folded from the same area of ​​the corrugated paper. The rotating connection ends of the upper cover 1 and the lower box 2 are connected as one piece through the connecting edge retained by the folding. The lower box body 11, the movable plate 4, the locking hole 5 on the movable plate 4, and the paper springs 6 at both ends of the movable plate 4 (including the outer paper spring plate 12 and the inner paper spring plate 13, and the spring structure at the connection between the two is also formed by folding) of the lower box 2 are also folded from the corresponding areas of the corrugated paper. At the same time, the reinforcing plate 14 of the lower box 2 and the folding plate 15 on the reinforcing plate 14 corresponding to the locking hole 5 are also fixedly cooperated with the movable plate 4 by folding and attaching specific areas of the corrugated paper. The entire folding process relies solely on the structural deformation of a single sheet of corrugated cardboard, without any non-paper components or additional splicing steps, ensuring the integrity and continuity of the packaging box structure. Furthermore, the elimination of non-paper auxiliary components reduces costs, minimizes assembly steps, and facilitates recycling.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0063] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusivity.

[0064] The term "comprises" implies that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A packaging box, characterized in that, include: The upper cover and the lower box are provided. A wedge-shaped block is provided on one end of the upper cover. The other end of the upper cover is rotatably connected to one end of the lower box. A movable plate is provided on the other end of the lower box. A locking hole is provided on the movable plate corresponding to the wedge-shaped block. Paper springs are provided at both ends of the movable plate. When the upper cover is closed on the lower box, the paper springs are pressed or released to make the wedge-shaped block disengage from or insert into the locking hole.

2. The packaging box according to claim 1, characterized in that, The upper cover includes a closing part and a limiting part, the closing part and the limiting part are fixedly connected, the closing part is rotatably connected to one end of the lower box, and the wedge block is disposed on the limiting part. When the upper cover is closed onto the lower box, the limiting part is used to restrict the movable plate from moving outward.

3. The packaging box according to claim 1, characterized in that, The wedge-shaped block is provided with a locking part, which abuts against the inner wall of the lock hole to limit the closing of the upper cover.

4. The packaging box according to claim 3, characterized in that, The wedge-shaped block is provided with a ramp portion, one end of which is connected to the upper cover, and the other end of which is connected to the locking portion to support the locking portion.

5. The packaging box according to claim 1, characterized in that, The lower box includes a lower box body, the two ends of which are connected to the two ends of the movable plate by at least one paper spring.

6. The packaging box according to claim 5, characterized in that, The paper spring includes an outer paper spring plate and an inner paper spring plate. One side of the outer paper spring plate is connected to the lower box body, the other side of the outer paper spring plate is connected to one side of the inner paper spring plate, and the other side of the inner paper spring plate is connected to the movable plate.

7. The packaging box according to claim 6, characterized in that, The connection between the outer side plate and the inner side plate of the paper spring has a spring-rebound structure.

8. The packaging box according to claim 1, characterized in that, The lower box also includes a reinforcing plate, which is attached to the movable plate.

9. The packaging box according to claim 8, characterized in that, A folding plate is provided on the reinforcing plate at the position corresponding to the key hole, and the folding plate is used to cover the empty part of the key hole.

10. The packaging box according to claim 1, characterized in that, The packaging box is made by folding a single sheet of corrugated cardboard.

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