A self-locking carton

Abstract

The present disclosure provides a self-locking carton, which relates to the field of carton manufacturing and includes a box bottom, wherein the box bottom includes two staggered self-locking plates, each of which is provided with an inserting portion and an inserted portion that can be interlocked with each other, and the two self-locking plates form two self-locking groups in a locked state, and the self-locking group includes an inserting portion of one self-locking plate and an inserted portion of the other self-locking plate, and a triangular area is provided at the free end of the inserted portion. The self-locking carton of the present disclosure has triangular areas added to both self-locking plates, which, on the one hand, increases the width of the inserted portion, so that after the inserting portion and the inserted portion form a self-locking group, the inserting portion is not easy to slide out, thereby improving the connection strength; on the other hand, the triangular vertices of the triangular area are close to the outside, which can facilitate the insertion of the inserting portion into the inside of the inserted portion quickly when installing the box bottom, thereby improving the installation efficiency, and the overall connection strength of the box bottom is improved and it is not easy to be damaged.

Description

Technical Field

[0001] The present disclosure relates to the field of carton manufacturing, and in particular to a self-locking carton. Background Art

[0002] Currently, there are more and more cartons with self-locking bottom structures on the market. However, for self-locking cartons with large length and height and narrow width, the self-locking bottom of existing cartons is often easily damaged due to the heavy weight of the heavy objects in the box.

[0003] The main reason is that although the self-locking bottoms are interlaced and inserted into each other, the inserted part of the self-locking bottom is relatively narrow. When the weight in the box is relatively heavy, the inserted part of the self-locking bottom is easy to slide out, so there is a problem of insufficient connection strength of the self-locking bottom and a high breakage rate of the carton. After research, it was found that when the insertion part of the existing self-locking bottom slides out of the inserted part and causes the self-locking bottom to be damaged, the above-mentioned insertion part mostly slides out from the outside of the inserted part first. Therefore, in order to improve the connection strength of the self-locking bottom, it is necessary to first reduce the probability of the insertion part sliding out from the outside of the inserted part first. Summary of the Invention

[0004] The present invention mainly solves the technical problem in the prior art that the bottom connection strength of the carton is insufficient and easily damaged, and provides a self-locking carton with high bottom connection strength and not easy to be damaged.

[0005] In order to solve the above-mentioned technical problems and achieve the above-mentioned disclosed purposes, the present disclosure provides a self-locking carton, including a box bottom, wherein the box bottom includes two staggered and locked self-locking plates, and both of the self-locking plates are provided with an inserting part and an inserted part that can be interlocked, and the two self-locking plates form two self-locking groups in the locked state, and the self-locking groups include the inserting part of one self-locking plate and the inserted part of the other self-locking plate, and the free end of the inserted part is provided with a triangular area.

[0006] In one embodiment, the present invention comprises a first main box panel, a first side box panel, a second main box panel and a second side box panel which are connected in sequence by folds, the bottom edge of the first main box panel is the first connecting side, the bottom edge of the second main box panel is the second connecting side, the two self-locking panels are respectively connected to the first connecting side and the second connecting side, the ends on the same side of the first connecting side and the second connecting side are connected by a folding wing connecting edge, the bottom edges of the first side box panel and the second side box panel are the folding wing connecting edges, the folding wing connecting edges are both provided with folding wings which can be folded toward the inside of the self-locking carton, the inserted portion is provided with an adhesive portion, and the adhesive portion can be bonded to the adjacent folding wings.

[0007] In one embodiment, the two self-locking plates include a first self-locking plate connected to the first connecting side and a second self-locking plate connected to the second connecting side, the first self-locking plate including a first insertion portion and a first inserted portion, the second self-locking plate including a second insertion portion and a second inserted portion, a first slot is provided on a side of the first main box plate close to the first inserted portion, a second slot is provided on a side of the second main box plate close to the second inserted portion, a first insertion protrusion is provided at the insertion end of the first insertion portion, and a second insertion protrusion is provided at the insertion end of the second insertion portion, the self-locking group includes a first self-locking group and a second self-locking group, the first insertion protrusion is inserted into the second slot, so that the first insertion portion and the second inserted portion constitute the first self-locking group, and the second insertion protrusion is inserted into the first slot, so that the second insertion portion and the first inserted portion constitute the second self-locking group.

[0008] In one embodiment, the first self-locking plate and the second self-locking plate have the same shape, the edge of the first inserted portion used to connect to the first connecting side is a first bottom edge, and the length of the first bottom edge is half the length of the self-locking carton.

[0009] In one embodiment, the contour line of the first inserted portion includes parallel short sides, outer fold line sides, extended sides and the first base side connected in sequence, the parallel short sides are parallel to the first base side, the outer fold line side is one side of the triangular area, the other side of the triangular area is collinear with the extended side, the connection point between the outer fold line side and the extended side is the triangle vertex, and the vertical distance from the triangle vertex to the first base side is equal to the length of the vertical projection of the extension side onto the first base side.

[0010] In one embodiment, a tongue is provided on the side of the first main box panel away from the first side box panel, and the tongue is connected to the second side box panel. The folding wing can form a complementary structure with the bottom of the tongue after being folded tightly toward the second side box panel.

[0011] In one embodiment, the tongue is connected to the first main box panel via a tongue fold, the bottom of the tongue is configured as a stepped bottom, the outer contour of the stepped bottom includes a first beveled edge, a vertical short edge, and a second beveled edge, the vertical short edge is parallel to the tongue fold, the distance from the vertical short edge to the tongue fold does not exceed / of the tongue width, the second beveled edge is adjacent to the tongue fold and the angle between the second beveled edge and the tongue fold is less than °.

[0012] In one embodiment, the contour line of the folding wing includes a parallel wing edge, an inclined wing edge arranged on one side of the parallel wing edge, and a stepped wing edge arranged on the other side of the parallel wing edge. After the folding wing at the bottom of the second side box board is folded along the folding wing connecting edge, a gap is formed between the stepped wing edge of the folding wing and the stepped bottom of the tongue.

[0013] In one embodiment, the parallel wing edge is parallel to the flap connecting edge, and the distance from the parallel wing edge to the flap connecting edge is equal to the length of the vertical projection of the extension edge onto the first bottom edge.

[0014] In one embodiment, the adhesive portion is connected to the extended edge, and the outline of the adhesive portion includes a first connecting edge having one end connected to the triangular vertex, the other end of the first connecting edge is connected to a horizontal short edge, and the connection point between the parallel wing edge and the stepped wing edge in the folding wing coincides with the triangular vertex.

[0015] Compared with the prior art, the self-locking carton disclosed in the present invention has the following beneficial effects:

[0016] 1. Triangular areas are added to both self-locking plates. On the one hand, the width of the inserted part is increased, making it difficult for the inserted part to slip out after forming a self-locking group with the inserted part, thereby improving the connection strength. On the other hand, the triangular vertices of the triangular areas are close to the outside, which makes it easier to quickly insert the inserted part into the inside of the inserted part when installing the box bottom, thereby improving installation efficiency.

[0017] 2. In the box state, a flap is bonded between the first self-locking plate and the second self-locking plate, which increases the bonding area between the flap and the adhesive portion, further enhancing the connection strength of the carton bottom and making it less likely to be damaged;

[0018] 3. The self-locking carton can be folded in the box state. After the carton is folded, it becomes a flat structure, which can save storage space;

[0019] 4. After the self-locking carton is folded, a gap is reserved between the stepped wing edge of the folding wing and the stepped bottom of the tongue, so that the folding wing and the tongue will not have an overlapping area, reducing the thickness of the carton after folding, and further compressing the storage space after the carton is folded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 This is a structural diagram of a self-locking carton disclosed in the present invention;

[0021] Attachment Figure 2 This is a schematic diagram of the improvement of the existing carton in the unfolded state disclosed in the present invention;

[0022] Attachment Figure 3 This is a schematic diagram of a self-locking carton in a planar unfolded form disclosed herein;

[0023] Attachment Figure 4 This is a structural diagram of a self-locking carton disclosed herein that hides a second self-locking plate;

[0024] Attachment Figure 5 This disclosure Figure 3 A magnified view of part A in FIG;

[0025] Attachment Figure 6 This disclosure Figure 3 A magnified view of part B in FIG;

[0026] Attachment Figure 7 This is a schematic diagram of the structure of a self-locking carton after being folded;

[0027] Attachment Figure 8 It is a structural diagram of another embodiment of the present disclosure.

[0028] Explanation of the numbers in the figure: 1. self-locking carton; 11. first slot; 12. second slot; 13. first main box board; 14. second main box board; 15. first side box board; 16. second side box board; 17. first connecting side; 18. second connecting side; 19. flap connecting edge; 2. box bottom; 20. self-locking plate; 201. inserting part; 202. inserted part; 21. first self-locking plate; 211. first inserting part; 212. first inserted part; 213. first inserting protrusion; 22. second self-locking plate; 221. second inserting part; 222. second inserted part; 223. first Two insertion protrusions; 23. First self-locking group; 24. Second self-locking group; 3. Triangular area; 41. First bottom edge; 42. Parallel short edge; 43. Outer fold line edge; 44. Extended edge; 45. Second bottom edge; 5. Folded wing; 51. Parallel wing edge; 52. Inclined wing edge; 53. Stepped wing edge; 531. Third beveled edge; 532. Second vertical short edge; 533. Fourth beveled edge; 6. Adhesive portion; 61. First connecting edge; 62. Horizontal short edge; 7. Tongue; 71. Tongue crease; 72. First beveled edge; 73. Vertical short edge; 74. Second beveled edge; 75. Extended short edge. DETAILED DESCRIPTION

[0029] To make the purposes, features, and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative work shall fall within the scope of protection of the present disclosure.

[0030] Self-locking cartons generally include main carton panels, side carton panels and a bottom. The length of the main carton panel corresponds to the length of the self-locking carton, and the width of the main carton panel corresponds to the height of the self-locking carton; the length of the side carton panel corresponds to the height of the self-locking carton, and the width of the side carton panel corresponds to the width of the self-locking carton; the length of the bottom corresponds to the length of the self-locking carton, and the width of the bottom corresponds to the width of the self-locking carton.

[0031] Figures 1 to 8 Two embodiments of a self-locking carton disclosed in the present invention are presented.

[0032] Example 1:

[0033] Reference Figure 1 、 Figure 2 A self-locking carton, which is in a box state when in use and is often in an unfolded state when printed and shipped to save storage space. In the box state, the self-locking carton 1 is provided with a box bottom 2. The self-locking carton 1 includes a first main box panel 13 and a second main box panel 14 arranged parallel to each other, and a first side box panel 15 and a second side box panel 16 arranged parallel to each other. The length of the self-locking carton 1 is represented by L, the width by W, and the height by H. The first main box panel 13, the first side box panel 15, the second main box panel 14 and the second side box panel 16 are connected in sequence by folds, and the length of the fold is equal to the height H of the self-locking carton 1. A tongue 7 is provided on the side of the first main box panel 13 away from the first side box panel 15, and the first main box panel 13 is connected to the second side box panel 16 through the above-mentioned tongue 7.

[0034] Reference Figure 1-3 The bottom 2 of the box includes two staggered locked self-locking plates 20. Both self-locking plates 20 are provided with an inserting portion 201 and an inserted portion 202 that can be buckled with each other. The two self-locking plates form two self-locking groups in the locked state. The self-locking group includes the inserting portion 201 of one self-locking plate and the inserted portion 202 of the other self-locking plate. The free end of the inserted portion 202 is provided with a triangular area 3.

[0035] The two self-locking plates 20 are respectively a first self-locking plate 21 and a second self-locking plate 22. The first self-locking plate 21 is provided with a first insertion portion 211 and a first inserted portion 212, and the second self-locking plate 22 is provided with a second insertion portion 221 and a second inserted portion 222. The first connecting side 17 of the bottom of the self-locking carton 1 corresponds to the bottom edge of the first main box board 13, and the second connecting side 18 of the bottom of the self-locking carton 1 corresponds to the bottom edge of the second main box board 14. The first self-locking plate 21 is connected to the first connecting side 17, and the second self-locking plate 22 is connected to the second connecting side 18. A first slot 11 is provided on the side of the first main box board 13 close to the first inserted portion 212, and a second slot 12 is provided on the side of the second main box board 14 close to the second inserted portion 222. The insertion end of the first insertion portion 211 is provided with a first insertion protrusion 213, and the insertion end of the second insertion portion 221 is provided with a second insertion protrusion 223.

[0036] The distance from the insertion end of the first insertion part 211 to the first connecting side 17 is equal to the width of the self-locking carton 1, and in the box state, the first insertion part 211 and the second inserted part 222 are arranged opposite to each other, and the first inserted part 212 and the second insertion part 221 are arranged opposite to each other, so that the first insertion part 211 can be inserted into the inner side of the second inserted part 222 and inserted into the second slot 12; the second insertion part 221 can be inserted into the inner side of the first inserted part 212 and inserted into the first slot 11, so that the first insertion part 211 and the second inserted part 222 can constitute a first self-locking group 23, and the second insertion part 221 and the first inserted part 212 can constitute a second self-locking group 24.

[0037] The triangular area 3 is added to the first self-locking plate 21 and the second self-locking plate 22. On the one hand, the width of the first inserted portion 212 and the second inserted portion 222 is increased, so that after the first inserting portion 211 forms the first self-locking group 23 with the second inserted portion 222, and the second inserting portion 221 forms the second self-locking group 24 with the first inserted portion 212, the first inserting portion 211 and the second inserting portion 221 are not easy to slide out, thereby improving the connection strength; on the other hand, the triangular vertex of the triangular area 3 is close to the outside, which can be easily installed on the bottom of the box. 2, the first insertion part 211 is quickly inserted into the inner side of the second inserted part 222, and the second insertion part 221 is inserted into the inner side of the first inserted part 212, thereby improving the installation efficiency; in order to further improve the load-bearing strength of the first self-locking group 23 and the second self-locking group 24, the outer edges of the first insertion part 211 and the second insertion part 221 are widened, which can reduce the first insertion part 211 from sliding out of the inner side of the second inserted part 222, or the second insertion part 221 from sliding out of the first inserted part 212 when being pressed by a heavy object.

[0038] In order to enhance the load-bearing capacity of the box bottom 2, folding wings 5 ​​are provided at the bottom of the first side box panel 15 and the second side box panel 16. The bottom edges of the first side box panel 15 and the second side box panel 16 are folding wing connecting edges 19. The folding wings 5 ​​are connected to the corresponding side box panels through the folding wing connecting edges 19. The first inserted portion 212 and the second inserted portion 222 are both provided with adhesive portions 6. The folding wings 5 ​​are folded toward the inside of the self-locking carton 1 and adhered to the inner side of the adhesive portion 6, so that the adhesive portion 6 can be bonded to the adjacent folding wings 5, which can strengthen the connection strength between the self-locking plate and the side box panel.

[0039] Reference Figure 4The edge of the first inserted portion 212 for connecting to the first connecting side 17 is the first bottom edge 41, and the length of the first bottom edge 41 is L1, where L1=1 / 2L; the edge of the first inserting portion 211 for connecting to the first connecting side 17 is the second bottom edge 45, and the length of the second bottom edge 45 is L2, where L2=L1=1 / 2L. The first inserted portion 212 and the first inserting portion 211 are integrally formed into a first self-locking plate 21, and the second self-locking plate 22 has the same structure as the first self-locking plate 21.

[0040] Reference Figure 3 、 Figure 5 The contour line of the first inserted portion 212 includes a parallel short side 42, an outer fold line side 43, an extended side 44 and a first base side 41 connected in sequence. The parallel short side 42 is parallel to the first base side 41. The length of the parallel short side 42 is L3. The vertical distance from the connecting vertex of the outer fold line side 43 and the extended side 44 to the first base side 41 is E1. The length of the extended side 44 after vertical projection to the first base side 41 is E2. E1=E2=65%~70%W, L3=30%~35%(L1-E2).

[0041] Reference Figure 3 、 Figure 6 The tongue 7 is connected to the first main box board 13 through the tongue fold 71. The bottom of the tongue 7 is set to a stepped bottom. The outer contour line of the stepped bottom includes a first beveled edge 72, a vertical short side 73 and a second beveled edge 74. The vertical short side 73 is parallel to the tongue fold 71. The distance from the vertical short side 73 to the tongue fold 71 is C1. The width of the tongue 7 is W1, C1≤2 / 3W1, and the second beveled edge 74 is adjacent to the tongue fold 71 and the angle between the second beveled edge 74 and the tongue fold 71 is A1, A1<90°.

[0042] Reference Figure 3 、 Figure 5 The flaps 5 on the first side panel 15 and the second side panel 16 have the same structural dimensions. The flaps 5 on the first side panel 15 are described as an example. The bottom edge of the first side panel 15 is the flap connection edge 19, to which the flaps 5 are connected. The outline of the flaps 5 includes a parallel wing edge 51 parallel to the flap connection edge 19. The parallel wing edge 51 is connected to an inclined wing edge 52 on the side close to the first main panel 13, and a stepped wing edge 53 on the side close to the second main panel 14. One end of the inclined wing edge 52 is connected to the parallel wing edge 51, and the other end is connected to the vertex where the bottom of the first side panel 15 meets the first main panel 13. The stepped wing edge 53 includes a third beveled edge 531, a second vertical short edge 532, and a fourth beveled edge 533 connected in sequence, wherein the third beveled edge 531 is connected to the end of the parallel wing edge 51, and the fourth beveled edge 533 is connected to the bottom of the first side box panel 15 and the vertex where the second main box panel 14 is connected.

[0043] Reference Figure 3 、 Figure 5 The folding flap 5 provided on the second side box panel 16 is folded inwardly of the self-locking carton 1 and is tightly attached to the inner surface of the second side box panel 16 to form a complementary structure with the bottom of the tongue 7. In order to prevent the tongue 7 and the folding flap 5 from squeezing and interfering with each other after the carton is folded, a gap is reserved between the tongue 7 and the folding flap 5. The distance from the second vertical short side 532 to the fold between the first side box panel 15 and the second main box panel 14 is C2, and C2>C1.

[0044] After folding the flap 5 at the bottom of the second side box panel 16 along the bottom edge connected to the self-locking carton 1, the third beveled edge 531 is parallel to the first beveled edge 72, the vertical short side 73 is parallel to the second vertical short side 532, the fourth beveled edge 533 and the second beveled edge 74 have overlapping endpoints, the length of the vertical short side 73 is recorded as B1, the length of the second vertical short side 532 is recorded as B2, and the angle formed by the fourth beveled edge 533 and the bottom edge of the side box panel is A2, B2=B1, A1+A2<90°, and A1+A2 is close to 90°. When designing other dimensions, A1+A2 can be calculated as approximately equal to 90°.

[0045] Reference Figure 3 、 Figure 5 The pasting portion 6 is connected to the extended edge 44. The outline of the pasting portion 6 includes a first connecting edge 61 at one end connected to the extended edge 44 and the outer fold line edge 43 at the same time. The other end of the first connecting edge 61 is provided with a horizontal short side 62. The length of the horizontal short side 62 is B3. The distance from the horizontal short side 62 to the bottom of the first main box panel 13 is D1. The distance from the parallel wing edge 51 to the bottom edge of the connected side box panel is E3. The distance from the second vertical short side 532 to the fold between the first main box panel 13 and the first side box panel 15 is D2. The connection point of the first connecting edge 61 and the extended edge 44 is the triangle vertex P. The connection point of the parallel wing edge 51 and the stepped wing edge 53 in the flap 5 is Q. The distance from point Q to the fold between the first main box panel 13 and the first side box panel 15 is E4. When pasting, point Q is made to coincide with point P of the triangle. In order to achieve the purpose of point Q coinciding with point P, the dimensions are designed so that E3=E4=E1=E2 and D1=D2.

[0046] Reference Figure 5 、 Figure 6 Because during the pasting process, the vertical short side 73 and the horizontal short side 62 will have a slight offset due to the thickness of the carton, set B3 < B1, and the difference between B3 and B1 does not exceed 2mm. Try to avoid the above-mentioned offset phenomenon to prevent the purpose of point Q and point P from coinciding.

[0047] After point Q coincides with the triangle vertex point P, the first connecting edge 61 of the adhesive portion 6 coincides with the third beveled edge 531 of the folding wing 5, the horizontal short edge 62 and the second vertical short edge 532 are collinear, the angle between the extended edge 44 and the first connecting edge 61 is A3, and the angle between the parallel wing edge 51 and the third beveled edge 531 is A4, so A3+45°=A4.

[0048] Reference Figure 1 、 Figure 3 and Figure 7 The assembly principle of a self-locking carton disclosed in the present invention is as follows: first, fold the first main box panel 13, the first side box panel 15, the second main box panel 14 and the second side box panel 16 on the self-locking carton 1 along the creases in sequence; then, glue the tongue 7 connected to the first main box panel 13 to the second side box panel 16 with glue, so that the tongue crease 71 coincides with the longer side of the second side box panel 16 during gluing; secondly, glue the folding flap 5 on the first side box panel 15 to the adhesive portion 6 on the first self-locking plate 21, and the folding flap 5 on the second side box panel 16 to the adhesive portion 6 on the second self-locking plate 22; finally, pass the first insertion protrusion 213 from the inner side of the second self-locking plate 22 and insert it into the second slot 12, and pass the second insertion protrusion 223 from the inner side of the first self-locking plate 21 and insert it into the first slot 11, thereby forming a carton with a self-locking bottom.

[0049] If the cartons need to be folded and stacked, it is only necessary to apply force to the inside of the self-locking carton 1 from the extended edge 44 of the inserted part on the first self-locking plate 21 and the second self-locking plate 22, so that the folding flap 5 on the second side box plate 16 is folded toward the inside of the self-locking carton 1 and tightly attached to the inner surface of the second side box plate 16, so that the carton can become a flat structure, saving space for storing the cartons.

[0050] Example 2:

[0051] Reference Figure 8 The difference between this embodiment and the first embodiment is that the stepped bottom of the tongue 7 includes not only the first beveled edge 72, the vertical short edge 73 and the second beveled edge 74, but also an extended short edge 75. The extended short edge 75 is parallel to the parallel wing edge 51 on the folding flap 5. When the folding flap 5 on the second side box board 16 is folded toward the inside of the self-locking carton 1 and is tightly attached to the inner side of the second side box board 16, there is a gap between the extended short edge 75 and the parallel wing edge 51 to prevent squeezing and repulsion. This solution increases the width of the tongue 7, can increase the connection strength of the self-locking carton 1, and increase the stability of the self-locking carton 1.

[0052] In the description of this specification, the reference terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0054] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A self-locking carton, characterized in that: The box bottom (2) comprises two staggered self-locking plates (20), each of the two self-locking plates (20) is provided with an inserting portion (201) and an inserted portion (202) that can be locked with each other, and the two self-locking plates (20) form two self-locking groups in a locked state, the self-locking groups comprising the inserting portion (201) of one self-locking plate (20) and the inserted portion (202) of the other self-locking plate (20), and the free end of the inserted portion (202) is provided with a triangular area (3); The two self-locking plates (20) include a first self-locking plate (21) and a second self-locking plate (22), wherein the first self-locking plate (21) includes a first inserting portion (211) and a first inserted portion (212), and the second self-locking plate (22) includes a second inserting portion (221) and a second inserted portion (222); The first self-locking plate (21) and the second self-locking plate (22) have the same shape, the first inserted portion (212) includes a first bottom edge (41), and the length of the first bottom edge (41) is half the length of the self-locking carton (1); the contour line of the first inserted portion (212) includes parallel short sides (42), outer folding line sides (43), extended sides (44) and the first bottom edge (41) connected in sequence, the parallel short sides (42) are parallel to the first bottom edge (41), the outer folding line side (43) is one side of the triangular area (3), the other side of the triangular area (3) is collinear with the extended side (44), the connection point between the outer folding line side (43) and the extended side (44) is a triangle vertex, and the vertical distance from the triangle vertex to the first bottom edge (41) is equal to the length of the extended side (44) vertically projected onto the first bottom edge (41).

2. The self-locking carton according to claim 1, characterized in that: The invention comprises a first main box panel (13), a first side box panel (15), a second main box panel (14) and a second side box panel (16) which are connected in sequence by folds, wherein the bottom edge of the first main box panel (13) is a first connecting side (17), the bottom edge of the second main box panel (14) is a second connecting side (18), the two self-locking panels are respectively connected to the first connecting side (17) and the second connecting side (18), the same side ends of the first connecting side (17) and the second connecting side (18) are connected by a folding wing connecting edge (19), the bottom edges of the first side box panel (15) and the second side box panel (16) are the folding wing connecting edges (19), the folding wing connecting edges (19) are both provided with folding wings (5) which can be folded toward the inside of the self-locking carton (1), and the inserted portion (202) is provided with an adhesive portion (6), and the adhesive portion (6) can be bonded to the adjacent folding wings (5).

3. The self-locking carton according to claim 2, characterized in that: The first self-locking plate (21) is connected to the first connecting side (17), the second self-locking plate (22) is connected to the second connecting side (18), a first slot (11) is provided on a side of the first main box plate (13) close to the first inserted portion (212), a second slot (12) is provided on a side of the second main box plate (14) close to the second inserted portion (222), a first insertion protrusion (213) is provided at the insertion end of the first insertion portion (211), and a first insertion protrusion (214) is provided at the insertion end of the second insertion portion (221). The insertion end is provided with a second insertion protrusion (223), and the self-locking group includes a first self-locking group (23) and a second self-locking group (24). The first insertion protrusion (213) is inserted into the second slot (12), so that the first insertion part (211) and the second inserted part (222) constitute the first self-locking group (23), and the second insertion protrusion (223) is inserted into the first slot (11), so that the second insertion part (221) and the first inserted part (212) constitute the second self-locking group (24).

4. The self-locking carton according to claim 3, characterized in that: A tongue (7) is provided on a side of the first main box panel (13) away from the first side box panel (15), and the tongue (7) is connected to the second side box panel (16). The folding wing (5) is folded toward the second side box panel (16) and tightly attached to form a complementary structure with the bottom of the tongue (7).

5. The self-locking carton according to claim 4, characterized in that: The tongue (7) is connected to the first main box plate (13) through a tongue fold (71); the bottom of the tongue (7) is set to a stepped bottom; the outer contour line of the stepped bottom includes a first beveled edge (72), a vertical short edge (73) and a second beveled edge (74); the vertical short edge (73) is parallel to the tongue fold (71); the distance from the vertical short edge (73) to the tongue fold (71) does not exceed 2 / 3 of the width of the tongue (7); the second beveled edge (74) is adjacent to the tongue fold (71) and the angle between the second beveled edge (74) and the tongue fold (71) is less than 90°.

6. The self-locking carton according to claim 4, characterized in that: The outline of the folding wing (5) includes a parallel wing edge (51), an inclined wing edge (52) arranged on one side of the parallel wing edge (51), and a stepped wing edge (53) arranged on the other side of the parallel wing edge (51). After the folding wing (5) at the bottom of the second side box board (16) is folded along the folding wing connecting edge (19), a gap is formed between the stepped wing edge (53) of the folding wing (5) and the stepped bottom of the tongue (7).

7. The self-locking carton according to claim 6, characterized in that: The parallel wing edge (51) is parallel to the flap connecting edge (19), and the distance between the parallel wing edge (51) and the flap connecting edge (19) is equal to the length of the vertical projection of the extension edge (44) onto the first bottom edge (41).

8. The self-locking carton according to claim 6, characterized in that: The adhesive portion (6) is connected to the extended edge (44), and the outline of the adhesive portion (6) includes a first connecting edge (61) connected to the triangular vertex at one end, and the other end of the first connecting edge (61) is connected to a horizontal short edge (62), and the connection point between the parallel wing edge (51) and the stepped wing edge (53) in the folding wing (5) coincides with the triangular vertex.

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