A self-locking top and bottom cover box body and cut pieces

Abstract

This invention discloses a self-locking top and bottom lid box and its cut pieces, solving the problems of low production and assembly efficiency and the inability to self-lock again after opening in existing packaging boxes. It includes a first and second cut piece with a pressure line, folded along the pressure line. The first cut piece includes a side plate connected to a first inner folding plate, and the side plate has a U-shaped slot. The top of the slot is located at the pressure line between the side plate and the first inner folding plate. The portion surrounded by the slot and the pressure line forms a locking tongue. The second cut piece includes a side cover plate connected to a second inner folding plate, and the second inner folding plate has a first groove adapted to the locking tongue. This invention improves production and assembly efficiency and allows for self-locking again after repeated use.

Description

Technical Field

[0001] The invention relates to the technical field of packaging, and in particular provides a self-locking top and bottom cover box body and a cut piece. Background Art

[0002] Product packaging boxes are an indispensable part of modern logistics. Their production and assembly efficiency and anti-theft functions are extremely important in applications. Traditional packaging boxes are assembled with plastic tape, which has low assembly efficiency and no anti-theft function. They can be opened and restored to their original state without damage, and it is impossible to determine whether the box has been opened. The safety of the items in the box cannot be guaranteed.

[0003] The existing cutting piece structure design of the glue-free packaging box body is relatively complex, for example, a "tape-free packaging outer box" disclosed in Chinese patent documents, with publication number: CN221418970U, and the process of folding and assembling the cutting pieces into the box body is too cumbersome, resulting in low production efficiency and assembly efficiency of the box body; the existing anti-theft packaging box body is generally an integrated design of the ground box and the box cover, for example, a "anti-theft paper box" disclosed in Chinese patent documents, with publication number: CN221189507U, and the design of its anti-theft structure is relatively complex, and after the box cover is covered, additional operation steps need to be performed on the anti-theft structure, and it is impossible to self-lock and prevent theft when the box cover is covered, which further affects the production efficiency and assembly efficiency of the box body; in addition, the existing anti-theft packaging box body needs to destroy the anti-theft structure when opening, and it cannot be self-locking again when it is reused later. Summary of the invention

[0004] In order to solve the problems in the prior art that the production and assembly efficiency of the packaging box is low and it cannot be self-locked again after opening, the present invention provides a self-locking top and bottom cover box and cutting pieces, which improve the production and assembly efficiency and can self-lock again when opened and reused.

[0005] The specific scheme of the present invention is as follows.

[0006] A self-locking top and bottom cover box body piece, comprising a first piece with a pressing line and a second piece, which are folded along the pressing line, wherein the first piece comprises a side panel connected to a first inner folding plate, wherein the side panel is provided with a slot hole in the shape of a Chinese character "concave", wherein the top end of the slot hole is located at the pressing line between the side panel and the first inner folding plate, and the portion surrounded by the slot hole and the pressing line constitutes a locking tongue, and the second piece comprises a side cover panel connected to a second inner folding plate, wherein the second inner folding plate is provided with a first groove adapted to the locking tongue.

[0007] A pressing line is provided at the connection between the two cutting pieces. After the first cutting piece and the second cutting piece are folded along the pressing line, under the action of the inward folding of the first inner folding plate, the locking tongue protrudes outward and can be engaged with the first groove to realize self-locking of the two cutting pieces. The self-locking structure is simply designed, which improves the production efficiency of the cutting pieces.

[0008] Preferably, the side panels include two first side panels and two second side panels, the first side panels and the second side panels are connected in a single row, the first side panel located at the edge is connected to a first connecting plate on one side away from the second side panel, the first side panel and the second side panel are connected to a bottom panel on the same side adjacent to the first connecting plate, and the first side panel and the second side panel are connected to the first inner folding plate on one side away from the bottom panel.

[0009] When the first cutting piece is folded along the pressing line, the four bottom panels together constitute the bottom surface, the four side panels respectively constitute the four side surfaces, the four first inner folding panels are folded inward, the height of the first inner folding panels is less than the height of the side panels, and the first connecting panel is sandwiched between the second side panels and the first inner folding panels.

[0010] Preferably, two adjacent sides of adjacent first inner folding plates are respectively provided with matching protrusions and notches, and after the first cut piece is folded along the pressing line, the adjacent protrusions and notches are engaged with each other.

[0011] When the first cut piece is folded along the pressing line, the four first inner folding plates are folded inward, and the protrusions and the notches are engaged and restrained with each other. It can be directly formed by folding without bonding, and it is not easy to loosen, which effectively improves the assembly efficiency of the first cut piece.

[0012] Preferably, the locking tongue is located on the first side plate, and the second side plate is provided with a hand-carrying hole. There are two locking tongues, respectively located on the two first side plates, and there are two hand-carrying holes, respectively located on the two second side plates, for easy transportation.

[0013] Preferably, the second cut piece also includes a top plate, and the side cover plate includes two first side cover plates and two second side cover plates, the two sides of the top plate corresponding to the first side plate are connected to the first side cover plates, the other two sides of the top plate are connected to the second side cover plates, the two sides of the first side cover plate adjacent to the second side cover plate are connected to second connecting plates, and the side of the first side cover plate away from the top plate is connected to the second inner folding plate.

[0014] When the second panel is folded along the pressing line, the top plate constitutes the top surface, the four side cover plates constitute the four side surfaces, the second connecting plate is located inside, the second inner folding plate is folded inwardly, and the height of the second inner folding plate is less than that of the side cover plates.

[0015] Preferably, a separation plate is provided at a position of the first side cover plate corresponding to the lock tongue, and an edge of the separation plate is connected to the first side cover plate via a virtual knife line. Under the action of external force, the separation plate is separated from the first side cover plate, forming a hand hole on the first side cover plate.

[0016] The setting of the virtual knife line facilitates the separation plate to be separated from the first side cover plate to form a hand hole. The position of the hand hole corresponds to the position of the lock tongue. The lock tongue can be pressed inward by passing the hand through the hand hole, thereby canceling the interlocking relationship between the lock tongue and the first groove to achieve unlocking. The self-locking structure can be used repeatedly.

[0017] Preferably, a through hole is provided on the separation plate at the edge of the virtual knife line, wherein the shape and size of the through hole are convenient for an adult's finger to pass through easily, and is used to buckle the separation plate off the first side cover plate.

[0018] Preferably, the side of the second side cover plate away from the top plate is connected to the third inner folding plate, and the two sides of the third inner folding plate adjacent to the second side cover plate are provided with second grooves that cooperate with the second inner folding plate, and after the second cut piece is folded along the pressing line, the two ends of the second inner folding plate are engaged with the second grooves on the third inner folding plate.

[0019] When the second piece is folded and formed along the pressing line, the second inner folding plate and the third inner folding plate are folded inward, the second connecting plate is clamped between the second side cover plate and the third inner folding plate, and the second grooves on the second inner folding plate and the third inner folding plate are engaged and restrained with each other. It can be directly formed by folding without bonding, and it is not easy to loosen, which effectively improves the assembly efficiency of the second piece.

[0020] Preferably, each connection between the first and second panels is provided with a pressing line, the connection between the first inner folding plate and the side panel is provided with two parallel pressing lines, and the connection between the second and third inner folding plates and the side cover is also provided with two parallel pressing lines. The first and second panels are folded 90 degrees along each pressing line, i.e., folded into shape.

[0021] A self-locking top and bottom cover box body comprises a floor box and a box cover, and is formed by folding a pair of self-locking top and bottom cover box body pieces, wherein the first piece is folded along a pressing line to form the floor box, the locking tongue is outwardly protruding, and the second piece is folded along the pressing line to form the box cover, and when the box cover is put on the floor box, the locking tongue is engaged with a second inner folding plate to achieve self-locking.

[0022] When the box cover is put on, the box body is self-locked. If the box body is not destroyed, the box body cannot be opened, which has an anti-theft effect. When the box body needs to be opened, the separation plate is buckled along the virtual knife line to form a hand hole, and two hands pass through the hand hole to press the lock tongue inward to cancel the buckling relationship between the lock tongue and the first groove, so as to unlock and open the box cover.

[0023] Therefore, the present invention has the following beneficial effects: (1) During storage and transportation, the box is flattened and delivered in one piece. During forming, the first and second pieces are folded along the pressing line, the protrusions and the notches are engaged with each other, and the second grooves of the second inner folding plate and the third inner folding plate are engaged with each other. The box and the box cover are formed without gluing. The structural design and assembly process of the pieces are relatively simple, which improves the production efficiency and assembly efficiency of the box body. (2) The upper and lower pieces are formed, and when the box cover is buckled, the floor box and the inside of the box cover are engaged to achieve self-locking, without the need for additional operation steps on the anti-theft structure, further improving the assembly efficiency of the box body; (3) When opening, the separation plate is buckled open along the virtual knife line to form a hand hole. Two hands pass through the hand hole and press the lock tongue inward to cancel the buckling relationship between the lock tongue and the first groove, so that the box cover can be unlocked and opened, which has an anti-theft effect; (4) When the box cover is closed again, the floor box and the box cover can still be internally engaged to achieve self-locking, that is, they can still achieve self-locking when reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

[0025] Figure 1 It is a front view of the first cutting piece of the present invention.

[0026] Figure 2 It is a schematic isometric view of the first cutting piece of the present invention.

[0027] Figure 3 It is an axonometric schematic diagram of the ground box of the present invention.

[0028] Figure 4 It is a front view of the second panel of the present invention.

[0029] Figure 5 It is a schematic isometric view of the second cutting piece of the present invention.

[0030] Figure 6 It is an axonometric schematic diagram of the box cover of the present invention.

[0031] Figure 7 The figure is an axonometric diagram of a self-locking top and bottom cover box body before the box cover is closed.

[0032] Figure 8 The figure is an axonometric diagram of a self-locking top and bottom cover box body after the box cover is closed.

[0033] Fig. 9It is an axonometric schematic diagram of a self-locking top and bottom cover box body after being unsealed according to the present invention.

[0034] Fig.10 The figure is an axonometric diagram of a self-locking top and bottom cover box body of the present invention after the cover is opened.

[0035] In the figure: 1, first cutting piece, 11, bottom plate, 12, first side plate, 121, slot, 122, lock tongue, 13, second side plate, 131, hand hole, 14, first inner folding plate, 141, protrusion, 142, slot, 15, first connecting plate, 2, second cutting piece, 21, top plate, 22, first side cover plate, 221, separation plate, 222, virtual knife line, 223, hand hole, 224, through hole, 23, second side cover plate, 24, second inner folding plate, 241, first groove, 25, third inner folding plate, 251, second groove, 26, second connecting plate, 3, floor box, 4, box cover, 5, pressing line. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Embodiment 1.

[0038] A self-locking top and bottom cover box body of the present invention comprises a floor box 3 and a cover 4. The floor box 3 and the cover 4 are adapted in size so that the cover 4 is just buckled on the top of the floor box 3. The floor box 3 and the cover 4 are both formed by folding cut pieces, wherein the floor box 3 is formed by folding a first cut piece 1, and the cover 4 is formed by folding a second cut piece 2. A pressing line 5 is provided on both the first cut piece 1 and the second cut piece 2, and folding along the pressing line 5 can improve assembly efficiency.

[0039] like Figure 1 The figure shows the front view of the first panel of the present invention. The first panel 1 includes four side panels, and the first inner folding plate 14 is connected to the same side of the side panel. The connection between the side panel and the first inner folding plate 14 is provided with a pressing line 5. The side panel is provided with a slot 121 in the shape of a "concave" character, and the top of the slot 121 is located at the pressing line 5 between the side panel and the first inner folding plate 14. The portion surrounded by the slot 121 and the pressing line 5 constitutes a locking tongue 122. The second panel 2 includes four side cover plates, and the side cover plates are connected to the second inner folding plate 24. The edge of the second inner folding plate 24 is provided with a first groove 241 adapted to the locking tongue 122.

[0040] After the first cut piece 1 and the second cut piece 2 are folded along the pressing line 5, the locking tongue 122 protrudes outward under the action of the first inner folding plate 14 being folded inward, and can be engaged with the first groove 241 to realize self-locking of the two cut pieces, that is, to realize self-locking of the floor box 3 and the box cover 4. The self-locking structure is simple in design, which improves the production efficiency of the cut pieces. When the box cover 4 is buckled on the floor box 3, the locking tongue 122 on the floor box 3 and the first groove 241 on the box cover 4 form a buckling relationship, that is, the floor box 3 and the box cover 4 are internally engaged to realize self-locking, and no additional operation steps are required for the anti-theft structure, which improves the assembly efficiency of the box body.

[0041] Embodiment 2.

[0042] like Figure 1 Shown is a front view of the first cutting piece of the present invention, as shown in Figure 2 The figure shows an axonometric schematic diagram of the first cutting piece of the present invention. The first cutting piece 1 includes four side panels, which are the first side panel 12, the second side panel 13, the first side panel 12 and the second side panel 13 from left to right, and are connected in sequence according to the above order, that is, two first side panels 12 and two second side panels 13 are interlaced in a single row, and a pressure line 5 is set at the connection. The left side of the first side panel 12 located at the left edge is connected to the first connecting plate 15, and the bottom of each of the four side panels is connected to a bottom plate 11, and the top of each of the four side panels is connected to a first inner folding plate 14. The two sides of the first connecting plate 15 adjacent to the first inner folding plate 14 and the bottom plate 11 are inwardly retracted beveled edges. This design makes it easier to assemble the floor box 3 and makes it easier to align and fit the panels. Two adjacent sides of the adjacent first inner folding plate 14 are respectively provided with matching protrusions 141 and grooves 142, and the two first side panels 12 are provided with "concave" shaped grooves 121. The top of the groove 121 is located at the pressure line 5 between the first side panel 12 and the first inner folding plate 14. The part surrounded by the groove 121 and the pressure line 5 constitutes a lock tongue 122, that is, the lock tongue 122 is connected to the first inner folding plate 14.

[0043] In a preferred embodiment, an oblique angle is provided below the protrusion 141 on the first inner folding plate 14, and the oblique angle is located at the connection between the side plate and the first inner folding plate 14, so as to prevent the overall width of the first inner folding plate 14 from being greater than the width of the connected side plate due to the provision of the protrusion 141. If the oblique angle is not provided, the first inner folding plate 14 cannot be folded inward due to the obstruction of the protrusion 141.

[0044] In another preferred embodiment, Figure 1As shown, each first inner folding plate 14 is an axisymmetric structure. Both ends of the two first inner folding plates 14 connected to the first side plate 12 are provided with protrusions 141, and both ends of the two first inner folding plates 14 connected to the second side plate 13 are provided with notches 142. In the process of folding and assembling the first cut piece 1 into the floor box 3 in this embodiment, the arrangement of the protrusions 141 and the notches 142 makes the process of folding the first inner folding plates 14 inwardly more labor-saving and smooth, which is conducive to improving the assembly efficiency of the floor box 3.

[0045] In another preferred embodiment, both second side panels 13 are provided with hand holes 131 for carrying the box body. The shape and size of the hand holes 131 are suitable for four fingers of an adult to pass through easily, and the hand holes 131 are located below the box cover 4 to prevent the hand holes 131 from being covered when the box cover 4 is buckled on the floor box 3.

[0046] like Figure 3 The figure shows an axonometric schematic diagram of the floor box of the present invention, in which the floor box 3 is formed by folding the first cut piece 1 along the pressure line 5. When the first cut piece 1 is folded, the four side panels are first folded along the pressure line 5 between the side panels to form the four sides of the floor box 3, and the first connecting plate 15 is located inside. The four bottom panels 11 are folded along the pressure line 5 between the bottom panel 11 and the side panels to form the bottom surface of the floor box 3. Then the four first inner folding panels 14 are folded inward, and the first connecting plate 15 is sandwiched between the second side panel 13 and the first inner folding panel 14. The two adjacent sides of the adjacent first inner folding panels 14 are mutually engaged and restrained by the protrusion 141 and the notch 142, so that the four first inner folding panels 14 are mutually engaged inside the floor box 3. The first cut piece 1 can be directly formed by folding without bonding, and is not easy to loosen, which effectively improves the assembly efficiency of the first cut piece 1. The height of the first inner folding plate 14 needs to be smaller than the width of the second side plate 13, otherwise when folding the first panel 1, the first inner folding plate 14 must be folded first, and then the four side plates are folded, which limits the folding steps of the first panel 1, thereby reducing the assembly efficiency of the floor box 3. Under the action of the first inner folding plate 14 folding inward, the locking tongue 122 on the first side plate 12 protrudes outward, and the horizontal plane where the hand-carrying hole 131 on the second side plate 13 is located is located below the locking tongue 122.

[0047] In another preferred embodiment, each connection in the first panel 1 is provided with a pressure line 5, wherein each connection between the four side panels and the four first inner folding plates 14 is provided with two parallel pressure lines 5, and the top of the slot 121 is located near the pressure line 5 of the first side panel 12. When the first panel 1 is folded, 90 degrees are folded along each pressure line 5 to complete the assembly of the floor box 3. By arranging two parallel pressure lines 5 between the side panels and the first inner folding plate 14, the risk of damage at the pressure line 5 when the first inner folding plate 14 is folded 180 degrees is effectively reduced, and the locking tongue 122 connected to the pressure line 5 after the first inner folding plate 14 is folded inwardly 180 degrees is avoided to tilt upward. If the locking tongue 122 tilts upward under the effect of the first inner folding plate 14 folding inward, then in the process of covering the box cover 4, it is necessary to additionally press the locking tongue 122 downward, which will cause the assembly efficiency of the box body to be reduced. In this embodiment, two parallel pressure lines 5 are set between the side panel and the first inner folding plate 14, and the top end of the slot 121 is located at the pressure line 5 close to the first side panel 12, so that after the first inner folding plate 14 is folded inwardly along the pressure line 5, the locking tongue 122 will only protrude outward instead of curling up, thereby improving the assembly efficiency of the box body.

[0048] Embodiment three.

[0049] like Figure 4 Shown is a front view of the second cutting piece of the present invention, as shown in Figure 5 The figure shows an axonometric schematic diagram of the second cutting piece of the present invention. The second side panel 13 includes a top panel 21, and each of the four sides of the top panel 21 is connected to a side cover panel, and the four side covers include two first side cover panels 22 and two second side cover panels 23. The two first side cover panels 22 are respectively connected to the two sides of the top panel 21 corresponding to the two first side panels 12, and the two second side cover panels 23 are respectively connected to the two sides of the top panel 21 corresponding to the two second side panels 13. The two first side cover panels 22 are connected to the second inner folding panels 24 on the side away from the top panel 21, and the second inner folding panels 24 are provided with a first groove 241 adapted to the locking tongue 122 on the side away from the first side cover panel 22, and the first groove 241 is located at the edge of the second inner folding panel 24, and the other two sides of the second inner folding panel 24 are connected to the second connecting plate 26. The two corners of the second connecting plate 26 away from the first side cover plate 22 are designed to be beveled and rounded, respectively, wherein the bevel is located at the end close to the second side cover plate 23, and the rounded corner is located at the end away from the second side cover plate 23. The design of the beveled and rounded corners makes it easier to assemble the box cover and can also reduce the risk of damage to the box cover. The sides of the two second side cover plates 23 away from the top plate 21 are connected to the third inner folding plate 25, and the two ends of the third inner folding plate 25 adjacent to the second inner folding plate 24 are provided with second grooves 251 adapted to the second inner folding plate 24, and the end of the second groove 251 close to the second side cover plate 23 is beveled.

[0050] The two first side cover plates 22 are both provided with a separation plate 221, the edge of the separation plate 221 is connected to the first side cover plate 22 through a virtual knife line 222, and the separation plate 221 is separated from the first side cover plate 22 under the action of an external force, and a hand hole 223 is formed on the first side cover plate 22. The setting of the virtual knife line 222 facilitates the separation of the separation plate 221 from the first side cover plate 22 to form the hand hole 223, the position of the hand hole 223 corresponds to the position of the lock tongue 122, and the lock tongue 122 can be pressed inwardly by passing the hand hole 223, thereby canceling the buckling relationship between the lock tongue 122 and the first groove 241 to achieve unlocking, and the self-locking structure can be used repeatedly.

[0051] In another preferred embodiment, a through hole 224 is provided on the separation plate 221 at the edge of the virtual knife line 222 . The shape and size of the through hole 224 are convenient for an adult's finger to pass through easily, and is used to snap the separation plate 221 off the first side cover plate 22 .

[0052] like Figure 6 The box cover of the present invention is shown as an axonometric diagram. The box cover 4 is formed by folding the second cut piece 2. When the second cut piece 2 is folded, the four second connecting plates 26 are first folded along the pressure line 5 between the first side cover plate 22, and then the four side cover plates are folded along the pressure line 5 between the top plate 21. The four second connecting plates 26 are located inside the space enclosed by the four side cover plates and the top plate 21. The second inner folding plate 24 and the third inner folding plate 25 are folded inward along the pressure line 5 between the side cover plates respectively, and the second inner folding plate 24 and the second grooves 251 on the third inner folding plate 25 at both ends are mutually engaged and restrained, so that the two second inner folding plates 24 and the two third inner folding plates 25 are mutually engaged inside the box cover 4. The second cut piece 2 can be directly formed by folding without bonding, and is not easy to loosen, which effectively improves the assembly efficiency of the second cut piece 2. When the box cover 4 is as Figure 6 When inverted as shown in , that is, when the top plate 21 is at the bottom, the separation plate 221 on the first side cover plate 22 is located below the first groove 241 of the third inner folding plate 25, and the virtual knife line 222 at the top of the separation plate 221 is located on the horizontal plane where the top of the first groove 241 is located.

[0053] In another preferred embodiment, the height of the third inner folding plate 25 is equal to the height of the second side cover plate 23. By adopting this design, the third inner folding plate 25 is less likely to loosen under the support force and friction force of the top plate 21, thereby better fixing the second inner folding plate 24, making the structure of the box cover 4 more stable, and further ensuring that the box body cannot be opened without damaging the box body, thereby enhancing the anti-theft effect of the box body.

[0054] In another preferred embodiment, each connection in the second panel 2 is provided with a pressing line 5, wherein each connection between the two first side cover plates 22 and the two second inner folding plates 24 is provided with two parallel pressing lines 5, and each connection between the two second side cover plates 23 and the two third inner folding plates 25 is provided with two parallel pressing lines 5. When the second panel 2 is folded, 90 degrees are folded along each pressing line 5 to complete the assembly of the box cover 4. By providing two parallel pressing lines 5 between the side cover plate and the second inner folding plates 24 and the third inner folding plates 25, the risk of damage at the pressing lines 5 when the second inner folding plates 24 and the third inner folding plates 25 are folded inwardly 180 degrees is effectively reduced, and the possibility of the box cover 4 being loose is also reduced.

[0055] like Figure 7 The figure shows an axonometric diagram of a self-locking top and bottom cover box body of the present invention before the box cover is put on. The first side plate 12 of the floor box 3 corresponds to the first side cover plate 22 of the box cover 4, the second side plate 13 of the floor box 3 corresponds to the second side cover plate 23 of the box cover 4, the vertical position of the separation plate 221 on the first side cover plate 22 of the box cover 4 is aligned with the vertical position of the locking tongue 122 on the first side plate 12 of the floor box 3, that is, the vertical position of the first groove 241 on the second inner folding plate 24 of the box cover 4 is aligned with the vertical position of the locking tongue 122 on the first side plate 12 of the floor box 3.

[0056] like Figure 8 The figure shows an axonometric diagram of a self-locking top and bottom cover box body of the present invention after the box cover is put on. When the box cover 4 is buckled on the floor box 3, the bottom end of the lock tongue 122, the bottom end of the first groove 241 and the bottom end of the separation plate 221 are all located on the same horizontal plane. Since the lock tongue 122 protrudes outward under the action of the inward folding of the first inner folding plate 14, when the box cover 4 is put on, the lock tongue 122 and the first groove 241 of the second inner folding plate 24 on the box cover 4 are engaged with each other to form a buckle, so that the self-locking of the top and bottom cover box body is realized, and the box cover 4 cannot be opened without destroying the box body, thereby ensuring the anti-theft effect of the box body. In other words, if the separation plate 221 is not separated from the first side cover plate 22, it can be judged that the box body has not been opened. After the box cover 4 is put on, the hand-held hole 131 on the second side plate 13 of the floor box 3 is located below the box cover 4, which is convenient for carrying the top and bottom cover box body.

[0057] like Fig. 9 The figure shows an isometric view of a self-locking top and bottom cover box body after unsealing. When the top and bottom cover box body needs to be unsealed, it is only necessary to pass a finger through the through hole 224 on the separation plate 221 and buckle the separation plate 221 along the virtual knife line 222 to form a hand hole 223 on the first side cover plate 22, and the position of the hand hole 223 is directly opposite to the position of the lock tongue 122.

[0058] like Fig.10The figure shows an axonometric diagram of a self-locking top and bottom cover box body of the present invention after the box cover is opened. After the separation plate 221 on the box cover 4 is buckled open, the two hands pass through the hand hole 223 to press the lock tongue 122 inward, canceling the buckling relationship between the lock tongue 122 and the first groove 241 on the second inner folding plate 24, thereby opening the upper cover. After opening the upper cover, the pressure of the hand on the lock tongue 122 is canceled, and the lock tongue 122 resumes the state of protruding outward. Because the separation plate 221 on the box cover 4 is separated from the first side cover plate 22 under the action of external force and cannot be restored, even if the box cover 4 is closed again, it can still be judged that the box body has been opened.

[0059] When the box cover 4 is buckled again after opening, the lock tongue 122 is again engaged with the first groove 241 of the second inner folding plate 24 on the box cover 4 to form a buckle, and the self-locking of the top and bottom cover box body is realized again. When the box cover 4 needs to be opened again, it is only necessary to press the lock tongue 122 inward through the hand hole 223 again, cancel the buckle relationship between the lock tongue 122 and the first groove 241 on the second inner folding plate 24, and then open the upper cover again. After opening the upper cover, the pressure of the hand on the lock tongue 122 is canceled, and the lock tongue 122 resumes the state of protruding outward. In other words, a self-locking top and bottom cover box body of the present invention can still be reused after the anti-theft structure is destroyed. When the box body is reused, its self-locking function can also be reused.

[0060] The self-locking top and bottom cover box body and the cut pieces of the present invention can be made of paper material, plastic material or other materials. In a preferred embodiment, the self-locking top and bottom cover box body and the cut pieces of the present invention are made of paper material. Compared with other materials, the use of paper material is more environmentally friendly and has a lower cost, and is suitable for mass production and one-time use. In addition, because paper material is easy to cut and shape, the design is more flexible, and various functions and structural designs in the present invention can be realized.

[0061] The self-locking top and bottom cover box of the present invention is flattened and delivered in one piece during storage and transportation. During forming, the first cut piece 1 and the second cut piece 2 are folded along the pressing line 5, the protrusion 141 and the notch 142 are engaged with each other, and the second groove 251 of the second inner folding plate 24 and the third inner folding plate 25 are engaged with each other, so that the bottom box 3 and the box cover 4 are formed without bonding. The structural design and assembly process of the cut pieces are relatively simple, which improves the production efficiency and assembly efficiency of the box body; the upper and lower pieces are formed, and the bottom box 3 is locked when the box cover 4 is buckled. It is self-locking by engaging with the inside of the box cover 4, and there is no need to perform additional operation steps on the anti-theft structure, which further improves the assembly efficiency of the box body; when opening, the separation plate 221 is buckled open along the virtual knife line 222 to form a hand hole 223, and both hands pass through the hand hole 223 to press the lock tongue 122 inwardly, and the buckling relationship between the lock tongue 122 and the first groove 241 is cancelled, so that the box cover 4 can be unlocked and opened, which has an anti-theft effect; when the box cover 4 is buckled again, the floor box 3 and the box cover 4 can still be internally engaged to achieve self-locking, that is, it can still achieve self-locking when used again.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A self-locking top and bottom cover box, characterized in that: The utility model comprises a floor box and a box cover, wherein the floor box is formed by folding a first cut piece, and the box cover is formed by folding a second cut piece, the first cut piece and the second cut piece are both provided with a pressing line, and are folded along the pressing line, a first inner folding plate is provided at the open end of the floor box, and first slot holes in a "concave" shape are provided on both sides of the floor box, the top end of the first slot hole is located at the pressing line of the open end of the floor box, the part surrounded by the first groove and the pressing line bulges outward to form a locking tongue, and the box cover is provided with a second inner folding plate, and the second inner folding plate is engaged with the locking tongue to realize self-locking.

2. A self-locking top and bottom cover box according to claim 1, characterized in that: The first panel includes two first side panels and two second side panels, the first side panels and the second side panels are connected in a single row, a side of the first side panel located at the edge away from the second side panel is connected to the first connecting panel, the first side panel and the second side panel are connected to the bottom panel on the same side adjacent to the first connecting panel, the first side panel and the second side panel are connected to the first inner folding panel on one side away from the bottom panel, and the locking tongue is located on the first side panel.

3. A self-locking top and bottom cover box according to claim 2, characterized in that: Two adjacent sides of the adjacent first inner folding plate on the floor box are respectively provided with a protrusion and a notch. After the first inner folding plate is folded inwardly along the pressure line, the adjacent protrusions and notches are engaged with each other.

4. A self-locking top and bottom cover box according to claim 2, characterized in that: When the first cut piece is folded to form the floor box, the four bottom panels are folded along the pressing line to form the bottom surface of the floor box, and the first side panel and the second side panel are folded along the pressing line to form the side surface of the floor box.

5. The self-locking top and bottom cover box according to claim 2, characterized in that: The second cutting piece includes a top panel, the two sides of the top panel corresponding to the first side panel are connected to the third side panel, the other two sides of the top panel are connected to the fourth side panel, the two sides of the third side panel adjacent to the fourth side panel are connected to the second connecting panel, and the side of the third side panel away from the top panel is connected to the second inner folding panel.

6. A self-locking top and bottom cover box according to claim 5, characterized in that: A separation plate is provided at a position on the third side panel corresponding to the lock tongue, and an edge of the separation plate is connected to the third side panel by a virtual knife line. Under the action of an external force, the separation plate is separated from the third side panel, and a hand hole is formed on the third side panel. The lock tongue is pressed inwardly through the hand hole, and the lock tongue is unlocked from the second inner folding plate.

7. A self-locking top and bottom cover box according to claim 6, characterized in that: The separation plate is provided with a through hole at the edge of the virtual knife line.

8. The self-locking top and bottom cover box according to claim 5, characterized in that: The fourth side panel is connected to a third inner folding plate at one side away from the top panel, and the third inner folding plate is provided with grooves matching with the second inner folding plate on both sides adjacent to the fourth side panel, and after the second inner folding plate and the third inner folding plate are folded inwardly along the pressure line, the two ends of the second inner folding plate engage with the grooves on the third inner folding plate.

9. The self-locking top and bottom cover box according to claim 8, characterized in that: A pressing line is provided at each connection between the first cutting piece and the second cutting piece, two parallel pressing lines are provided at the connection between the first inner folding plate and the first side panel or the second side panel, two parallel pressing lines are also provided at the connection between the second inner folding plate and the third side panel, and two parallel pressing lines are also provided at the connection between the third inner folding plate and the fourth side panel. The first cutting piece and the second cutting piece are folded 90 degrees along the pressing lines to form the floor box and the box cover.

10. A self-locking top and bottom cover box according to any one of claims 2 to 9, characterized in that: The second side plate is provided with a carrying hole.

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