Paper composite lock catch, paperboard blank, carton structural member and carton

Abstract

The utility model relates to a paper composite lock catch, a paperboard blank, a carton structural member and a carton. The paper composite lock catch comprises a first paper fastener and a second paper fastener, wherein the first paper fastener and the second paper fastener are integrally formed. The integrally-formed first paper fastener comprises a first base plate, a first convex part and a containing hole. The first substrate is connected with the first convex part and is arranged around the first convex part; the integrally-formed second paper fastener comprises a second base plate and a second protruding part. The second convex part comprises a side plate and a top plate. A cavity is defined by the side plates and the top plate. The cavity is provided with an opening corresponding to the top plate. The second substrate is connected with the side plate and surrounds the side plate. The second protruding part is connected with the containing hole in an inserted mode. The side plate is fixedly connected with the first convex part. And the first paper fastener and the second paper fastener are connected into an integral structure. And the first substrate, the first convex part and the second substrate are enclosed to form a clamping groove.

Description

Technical Field

[0001] The present application relates to the technical field of cartons, and in particular to a paper composite lock, a cardboard blank, a carton structural member, and a carton. Background Art

[0002] In the packaging industry, when packaging large or heavy products, two boxes are sleeved outside the product either up and down or left and right, and a lock is used to lock the two boxes to prevent the two boxes from separating. Currently, plastic locks with simple structures are usually used to connect the two boxes. The plastic lock includes a male buckle and a female buckle. When using the plastic lock, the male and female buckles of the plastic lock are separated, and then the male buckle on the inner side of the box is connected to the female buckle on the outer side of the box. However, since the plastic lock is made of plastic itself, its environmental friendliness is poor, so the discarded plastic locks pose an environmental pollution problem. At the same time, the plastic lock has high hardness and strong pressure resistance, and is convenient and reliable to use. If a lock with the same structure is made of an environmentally friendly material (such as paper) to replace the plastic lock, it is difficult to achieve the functions of high hardness and strong pressure resistance of the plastic lock. Summary of the Utility Model

[0003] The embodiments of the present application provide a paper composite lock, a cardboard blank, a carton structural member, and a carton, which can effectively reduce the possibility of environmental pollution.

[0004] On the one hand, a paper composite lock is proposed according to the embodiments of the present application. The paper composite lock includes an integrally formed first paper fastener and an integrally formed second paper fastener.

[0005] The integrally formed first paper fastener includes a first substrate, a first convex portion, and a receiving hole. The first substrate is connected to the first convex portion and the first substrate surrounds the first convex portion. The integrally formed second paper fastener includes a second substrate and a second convex portion. The second convex portion includes a side plate and a top plate. The side plate and the top plate enclose a cavity. The cavity has an opening corresponding to the top plate. The second substrate is connected to the side plate and the second substrate surrounds the side plate. Wherein, the second convex portion is inserted into the receiving hole. The side plate is fixedly connected to the first convex portion. The first paper fastener and the second paper fastener are connected into an integral structure. The first substrate, the first convex portion, and the second substrate enclose a card slot.

[0006] The paper composite lock of the embodiment of the present application includes a first paper fastener and a second paper fastener which are integrally formed. The first paper fastener and the second paper fastener are connected and fixed to each other to form an integral structure. After the first paper fastener and the second paper fastener are connected, a card slot is formed for connecting with a box to be connected. The paper composite lock is used as a connecting piece as a whole to lock or unlock different boxes. The ways that the receiving hole of the first paper fastener is inserted into the second convex part of the second paper fastener, the second convex part includes a side plate and a top plate, the side plate of the second convex part is connected and fixed to the first convex part, and the side plate and the top plate enclose a cavity can all help to ensure the overall mechanical strength and load-bearing performance of the paper composite lock itself, so that the paper composite lock can meet the requirements of different packaging application scenarios. In addition, both the first paper fastener and the second paper fastener are made of degradable paper materials, so the first paper fastener and the second paper fastener themselves have good environmental protection and effectively reduce the possibility of the paper composite lock polluting the environment.

[0007] In some implementable ways, the side plate and the first convex part are adhesively fixed.

[0008] In some implementable ways, a glue-containing cavity is formed between the side plate and the first convex part, and the glue-containing cavity is filled with adhesive, and the adhesive bonds the side plate and the first convex part.

[0009] In some implementable ways, in the direction from the first substrate to the second substrate, the cross-sectional area of the glue-containing cavity decreases, and the cross-section of the glue-containing cavity is perpendicular to the axis of the receiving hole.

[0010] In some implementable ways, the outer surface of the side plate facing the first convex part is an inclined surface, and the inner surface of the first convex part facing the side plate is an inclined surface.

[0011] In some implementable ways, the top plate includes an intermediate convex part protruding towards the second substrate, the intermediate convex part connects two relatively arranged side plates, and in the radial direction of the receiving hole, the cavity includes sub-chambers located on opposite sides of the intermediate convex part.

[0012] In some implementable ways, the intermediate convex part includes a concave cavity, the concave cavity has an opening facing away from the second substrate, the top plate isolates the concave cavity from the cavity, and the concave cavity is not communicated with the cavity.

[0013] In some implementable ways, the receiving hole is a through hole, and in the thickness direction of the first substrate, the receiving hole penetrates the first substrate and the first convex part.

[0014] In some implementable ways, the receiving hole is a rectangular hole, and the four top corners of the receiving hole are rounded transition structures.

[0015] In some realizable ways, the shapes of the first substrate and the second substrate are both rectangular frames. Among them, the width of one side frame of the second substrate is smaller than the width of the corresponding side frame on the first substrate, and the widths of the other three side frames of the second substrate are equal to the widths of the corresponding side frames on the first substrate.

[0016] In another aspect, according to an embodiment of the present application, a cardboard blank is provided. The cardboard blank is used for connection with a paper composite lock. The cardboard blank includes more than two cardboards, a lock snap-in hole, and a lock avoidance hole.

[0017] More than two cardboards are stacked. The lock snap-in hole and the lock avoidance hole both penetrate through the stacked area of the cardboards. In a first direction, the lock avoidance hole is arranged on one side of the lock snap-in hole. The lock snap-in hole and the lock avoidance hole are communicated. In a second direction, the maximum width of the lock snap-in hole is smaller than the maximum width of the lock avoidance hole. The first direction is perpendicular to the second direction.

[0018] The paper composite lock can switch back and forth between the lock snap-in hole and the lock avoidance hole to realize the switching between the locked state and the unlocked state of the stacked area, so that more than two cardboards are in a stacked state or an openable state.

[0019] In some realizable ways, the cardboard blank further includes a flap. A flap is arranged on the outermost cardboard among more than two cardboards, and the flap opens or closes the lock avoidance hole.

[0020] In some realizable ways, both the lock snap-in hole and the lock avoidance hole are rectangular holes, and the four top corners of the lock snap-in hole and the four top corners of the lock avoidance hole are all rounded transition structures.

[0021] In another aspect, according to an embodiment of the present application, a carton structural member is provided. The carton structural member is used for a carton. The carton structural member includes a cardboard blank and a paper composite lock.

[0022] The cardboard blank includes more than two cardboards, a lock snap-in hole, and a lock avoidance hole. More than two cardboards are stacked. The lock snap-in hole and the lock avoidance hole both penetrate through the stacked area of the cardboards. In a first direction, the lock avoidance hole is arranged on one side of the lock snap-in hole. The lock snap-in hole and the lock avoidance hole are communicated. In a second direction, the maximum width of the lock snap-in hole is smaller than the maximum width of the lock avoidance hole. The first direction is perpendicular to the second direction;

[0023] The paper composite lock can be integrally inserted into or pulled out of the lock avoidance hole along the thickness direction of the cardboard. After insertion, the paper composite lock can enter the lock engagement hole from the lock avoidance hole, and the first convex portion and the lock engagement hole can be slidably engaged in the first direction. The first convex portion is snapped into or out of the lock engagement hole to switch the paper composite lock between the locked state and the unlocked state. In the locked state, the laminated area of the cardboard is snapped into the card slot. In the unlocked state, the paper composite lock is located in the lock avoidance hole and can be pulled out through the lock avoidance hole.

[0024] In another aspect, a carton according to an embodiment of the present application includes a carton structural member. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0026] Figure 1 is a schematic structural diagram of a paper composite lock according to an embodiment of the present application;

[0027] Figure 2 is an exploded structural diagram of a paper composite lock according to an embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of a second paper fastener according to an embodiment of the present application;

[0029] Figure 4 is a partial cross-sectional structural diagram of a paper composite lock according to an embodiment of the present application;

[0030] Figure 5 is a partial cross-sectional structural diagram of a paper composite lock according to an embodiment of the present application;

[0031] Figure 6 is a partial exploded structural diagram of a paper composite lock according to an embodiment of the present application;

[0032] Figure 7 is a schematic structural diagram of a paper composite lock according to an embodiment of the present application;

[0033] Figure 8 is a partial cross-sectional structural diagram of a paper composite lock according to an embodiment of the present application;

[0034] Figure 9 is a schematic structural diagram of a cardboard blank according to an embodiment of the present application;

[0035] Figure 10 is a schematic diagram of the connection process between a cardboard blank and a paper composite lock according to an embodiment of the present application;

[0036] Figure 11 is a schematic structural diagram of the connection state between a cardboard blank and a paper composite lock according to an embodiment of the present application;

[0037] Figure 12 It is a schematic diagram of a partial decomposition structure of a cardboard blank in an embodiment of the present application;

[0038] Figure 13 It is a schematic diagram of the structure of a carton structural member in an embodiment of the present application;

[0039] Figure 14 It is a schematic diagram of the structure of a carton in an embodiment of the present application;

[0040] Figure 15 It is a schematic diagram of a partial sectional structure of a carton in an embodiment of the present application.

[0041] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0042] Description of reference numerals:

[0043] 10. Paper composite lock; 10a. Card slot; 10b. Glue cavity; 20. First paper fastener; 21. First substrate; 22. First convex part; 221. Inner surface; 23. Accommodating hole; 30. Second paper fastener; 301. Cavity; 3011. Sub-cavity; 31. Second substrate; 32. Second convex part; 33. Side plate; 331. Outer surface; 34. Top plate; 341. Intermediate convex part; 3411. Concave cavity; 40. Adhesive; 100. Cardboard blank; 101. Lock snap hole; 102. Lock avoidance hole; 110. Cardboard; 111. First plate member; 1111. First snap hole; 1112. First avoidance hole; 112. Second plate member; 1121. Second snap hole; 1122. Second avoidance hole; 120. Flap; 200. Carton structural member; 300. Carton; 400. Handle; 401. Inner buckle; 402. Outer buckle; S. Axis; P. Axial direction; X. First direction; Y. Second direction. Detailed implementation manners

[0044] The following further describes in detail the implementation manners of the present application with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0046] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application may be combined with other embodiments.

[0047] The orientation words appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] An embodiment of the present application provides a carton. For example, the carton may include a first box body and a second box body. The first box body and the second box body are independent of each other. The first box body and the second box body can be used to package the product to be packaged. After the first box body and the second box body are connected, the first box body and the second box body can form a protection for the product located between the first box body and the second box body.

[0049] An embodiment of the present application provides a paper composite lock catch. Through ingenious structural design, while having environmental protection properties, it can replace the functions of existing plastic lock catches and has strong strength, toughness, etc. At the same time, a clamping structure that cooperates with the paper composite lock catch can be provided on the cardboard box, so that the paper composite lock catch can be used for cardboard boxes and can be widely applied to the market. After the positions of the first box body and the second box body are fixed respectively, the lock catch is used to lock the first box body and the second box body. The paper composite lock catch connects the first box body and the second box body to each other. The first box body and the second box body maintain a stable connection state under the limiting and constraining action of the lock catch, so that the first box body and the second box body are not easily separated or dispersed.

[0050] The paper composite lock catch, the first box body and the second box body can be connected to form a cardboard box. Both the first box body and the second box body can include cardboard blanks. The cardboard blank can include a plurality of stacked cardboard sheets. The paper composite lock catch can be connected to the cardboard blank to lock the stacked cardboard sheets, so as to stably maintain the stacked cardboard sheets in a stacked state and ensure that the stacked cardboard sheets do not become loose or dispersed.

[0051] Figure 1 Schematically shows the structure of the paper composite lock catch 10. Figure 2 Schematically shows the exploded structure of the paper composite lock catch 10. Figure 3 Schematically shows the structure of the second paper fastener 30. Figure 4 Schematically shows the partial sectional structure of the paper composite lock catch 10. Refer to Figures 1 to 4 As shown, the paper composite lock catch 10 provided by the embodiment of the present application includes an integrally formed first paper fastener 20 and an integrally formed second paper fastener 30.

[0052] The integrally formed first paper fastener 20 includes a first substrate 21, a first convex portion 22 and a receiving hole 23. The first substrate 21 is connected to the first convex portion 22 and the first substrate 21 surrounds the first convex portion 22. The integrally formed second paper fastener 30 includes a second substrate 31 and a second convex portion 32. The second convex portion 32 includes a side plate 33 and a top plate 34. The side plate 33 and the top plate 34 enclose to form a cavity 301. Along the axial direction P of the receiving hole 23, the cavity 301 has an opening corresponding to the top plate 34. The second substrate 31 is connected to the side plate 33 and the second substrate 31 surrounds the side plate 33. Among them, the second convex portion 32 is inserted into the receiving hole 23. The side plate 33 is fixedly connected to the first convex portion 22. The first paper fastener 20 and the second paper fastener 30 are connected into an integral structure. The first substrate 21, the first convex portion 22 and the second substrate 31 enclose to form a card slot 10a.

[0053] In some realizable ways, the first paper fastener 20 and the second paper fastener 30 can be independently processed and manufactured. The first paper fastener 20 is integrally formed, so that the first paper fastener 20 itself has good structural integrity and no splicing transition area. Thus, the first paper fastener 20 as a whole has good mechanical strength and load-bearing performance. The second paper fastener 30 is integrally formed, so that the second paper fastener 30 itself has good structural integrity and no splicing transition area. Thus, the second paper fastener 30 as a whole has good mechanical strength and load-bearing performance. Therefore, the paper composite lock 10 formed by the combination of the first paper fastener 20 and the second paper fastener 30 as a whole has good mechanical strength and load-bearing performance.

[0054] Both the first paper fastener 20 and the second paper fastener 30 are environmentally friendly products that can be naturally degraded. In some realizable ways, both the first paper fastener 20 and the second paper fastener 30 can be processed and manufactured by various raw pulps such as sugarcane pulp and wood pulp or by using recycled paper materials through processes such as pulping, forming, and compounding.

[0055] The second paper fastener 30 is inserted into the receiving hole 23 of the first convex part 22 through the second convex part 32, and the side plate 33 of the second convex part 32 is connected and fixed to the first convex part 22, so that the first convex part 22 and the side plate 33 form a double-force structure. Mutual support can be formed between the first convex part 22 and the side plate 33. When an external force (such as a compressive stress along the radial direction of the receiving hole 23) acts on the laminated area of the first convex part 22 and the side plate 33, the external force can be dispersed and conducted between the first paper fastener 20 and the second paper fastener 30, thereby effectively dispersing the load and reducing the possibility of the connection between the first convex part 22 and the second convex part 32 failing due to the collapse and deformation of the first convex part 22 and the second convex part 32.

[0056] At the same time, the top plate 34 of the second convex part 32 can effectively support the side plate 33 of the second convex part 32. The top plate 34 of the second convex part 32 can strengthen the side plate 33. When a local external force acts on the first convex part 22, the first convex part 22 can transmit the force to the side plate 33. The side plate 33 can disperse the force borne by its local area to other areas of the side plate 33 through the top plate 34, thereby effectively ensuring that the side plate 33 is not prone to collapse and deformation when bearing an external force. Therefore, the structural design of the second convex part 32 with both the side plate 33 and the top plate 34 is beneficial to improving the overall mechanical strength and load-bearing performance of the second convex part 32, and thus is beneficial to reducing the possibility of the side plate 33 being prone to collapse and deformation when bearing an external force.

[0057] After the side plate 33 of the second convex portion 32 is fixedly connected to the first convex portion 22, the first paper fastener 20 and the second paper fastener 30 are connected into an integral structure, thereby forming the paper composite lock 10. In the embodiment of the present application, during the use of the formed paper composite lock 10, the first paper fastener 20 and the second paper fastener 30 are used as an integral structure (i.e., the paper composite lock 10) to lock or unlock different boxes (such as the first box and the second box).

[0058] Along the axial direction P of the receiving hole 23, the first substrate 21 and the second substrate 31 are spaced apart. When the paper composite lock 10 locks different boxes, a part of the box can be inserted into the card slot 10a of the paper composite lock 10, and the first substrate 21 and the second substrate 31 can each overlap with the corresponding box, so that the paper composite lock 10 can be limited and constrained by the box, and it is not easy to change its position, nor is it easy to separate from the box and fall off the box. The outer surface of the first convex portion 22 can serve as the bottom wall of the card slot 10a. When the paper composite lock 10 locks different boxes, the outer surface of the first convex portion 22 can be in contact with the box, so that the outer surface of the first convex portion 22 is in direct contact with the box, so that the box forms a limit on the paper composite lock 10, which is beneficial to reducing the possibility that there is a gap between the first convex portion 22 and the box, resulting in loose connection between the paper composite lock 10 and the box and mutual shaking.

[0059] In some realizable ways, the top plate 34 is a cover plate. The cavity 301 formed by enclosing the side plate 33 and the top plate 34 of the second convex portion 32 is a blind hole structure. The cavity 301 has only one opening corresponding to the top plate 34. In some examples, no through hole penetrating the top plate 34 itself is provided on the top plate 34. The manner in which the side plate 33 and the top plate 34 of the second convex portion 32 enclose to form the cavity 301 makes the second convex portion 32 a hollow structure, which is beneficial to reducing the weight of the second paper fastener 30.

[0060] In some realizable ways, when the first paper fastener 20 and the second paper fastener 30 are assembled, the first convex portion 22 can abut against the surface of the second substrate 31 facing the first substrate 21, so that the first convex portion 22 can support the second substrate 31 and reduce the possibility of the second substrate 31 being folded and deformed towards the first substrate 21. The thickness direction of the first substrate 21 is the same as the axial direction P of the receiving hole 23. The thickness direction of the second substrate 31 is the same as the axial direction P of the receiving hole 23. The first substrate 21 and the second substrate 31 can be arranged parallel to each other. In some examples, along the thickness direction of the first substrate 21, the first convex portion 22 is provided on one side of the first substrate 21. Along the thickness direction of the second substrate 31, the second convex portion 32 is provided on one side of the second substrate 31.

[0061] The paper composite lock 10 of the embodiment of the present application includes a first paper fastener 20 and a second paper fastener 30 which are integrally formed. The first paper fastener 20 and the second paper fastener 30 are connected and fixed to each other to form an integral structure. After the first paper fastener 20 and the second paper fastener 30 are connected, a card slot 10a is formed for connecting with a box to be connected. The paper composite lock 10 as a whole is used as a connecting piece to lock or unlock different boxes. The way that the receiving hole 23 of the first paper fastener 20 is inserted into the second convex part 32 of the second paper fastener 30, the way that the second convex part 32 includes a side plate 33 and a top plate 34, the way that the side plate 33 of the second convex part 32 is connected and fixed to the first convex part 22, and the way that the side plate 33 and the top plate 34 enclose to form a cavity 301 can all help to ensure the overall mechanical strength and load-bearing performance of the paper composite lock 10 itself, so that the paper composite lock 10 can meet the requirements of different packaging application scenarios. In addition, both the first paper fastener 20 and the second paper fastener 30 are made of degradable paper materials, so that the first paper fastener 20 and the second paper fastener 30 themselves have good environmental protection, and effectively reduce the possibility of the paper composite lock 10 polluting the environment.

[0062] In some realizable ways, the side plate 33 of the second convex part 32 is adhesively fixed to the first convex part 22. After the second convex part 32 is inserted into the receiving hole 23, the side plate 33 and the first convex part 22 are adhesively bonded to achieve fixation, so that the first paper fastener 20 and the second paper fastener 30 are connected into an integral structure, and thus the second convex part 32 is not easily pulled out of the receiving hole 23 accidentally.

[0063] The way that the side plate 33 is adhesively fixed to the first convex part 22 does not require additional connection structures (such as connection holes) to be provided on the side plate 33 and the first convex part 22. Thus, on the one hand, it helps to reduce the possibility that the mechanical properties of the side plate 33 and the first convex part 22 become worse due to the need to provide additional connection structures on the side plate 33 and the first convex part 22. On the other hand, it helps to reduce the manufacturing difficulty and assembly difficulty of the side plate 33 and the first convex part 22 respectively.

[0064] In some realizable ways, Figure 5 Schematically shows a partial cross-sectional structure of the paper composite lock 10. Refer to Figure 4 and Figure 5 As shown, a glue-containing cavity 10b is formed between the side plate 33 of the second convex part 32 and the first convex part 22. The glue-containing cavity 10b is filled with an adhesive 40. The adhesive 40 bonds the side plate 33 and the first convex part 22.

[0065] After the second convex part 32 is inserted into the accommodation hole 23, a glue-containing cavity 10b can be formed between the side plate 33 and the first convex part 22. Then, a predetermined weight of the bonding glue 40 can be filled in the glue-containing cavity 10b. After the bonding glue 40 is cured, the connection and fixation between the side plate 33 and the first convex part 22 are achieved.

[0066] Both the first convex part 22 and the second convex part 32 are made of paper material. A large number of micropores exist in the structure of the first convex part 22 itself and in the structure of the side plate 33 of the second convex part 32 itself. Therefore, before curing, the bonding glue 40 can penetrate into the interiors of the first convex part 22 and the side plate 33 along the micropores, so that the first convex part 22 and the side plate 33 can absorb part of the bonding glue 40. After the bonding glue 40 that penetrates into the interiors of the first convex part 22 and the side plate 33 is cured, a large number of connecting branches can be formed.

[0067] The outer surfaces of the first convex part 22 and the side plate 33 respectively form a connection structure with the bonding glue 40, and at the same time, the bonding glue 40 that penetrates into the interiors of the first convex part 22 and the side plate 33 also forms a connection structure with the first convex part 22 and the side plate 33 respectively. Therefore, the method of using the bonding glue 40 to bond the side plate 33 and the first convex part 22 can effectively improve the connection mechanical strength among the first convex part 22, the bonding glue 40, and the second convex part 32, improve the structural integrity of the first convex part 22 and the second convex part 32, and thus improve the overall mechanical strength and load-bearing performance of the paper composite lock 10.

[0068] In some realizable ways, in the direction from the first substrate 21 to the second substrate 31, the cross-sectional area of the glue-containing cavity 10b decreases. The cross-section of the glue-containing cavity 10b is perpendicular to the axis S of the accommodation hole 23. The closer the glue-containing cavity 10b is to the second substrate 31, the smaller the glue-containing amount, and the less bonding glue 40 can be accommodated.

[0069] The closer the glue-containing cavity 10b is to the second substrate 31, the smaller the cross-sectional size of the glue-containing cavity 10b, so that small channels with capillary action can be formed in the area of the glue-containing cavity 10b close to the second substrate 31. When the bonding glue 40 is injected into the glue-containing cavity 10b from the larger opening close to the top plate 34 of the glue-containing cavity 10b, the bonding glue 40 can fill the entire glue-containing cavity 10b under capillary action, so that it is not easy to have the situation of poor wetting and cavity formation in the area of the glue-containing cavity 10b close to the second substrate 31.

[0070] In addition, the closer to the second substrate 31, the smaller the gap between the first convex part 22 and the side plate 33, so that the first convex part 22 and the side plate 33 mutually form a limiting constraint, making it not easy for the side plate 33 to swing significantly relative to the first convex part 22 in the accommodation hole 23, and reducing the possibility of squeezing the bonding glue 40 and extruding the bonding glue 40 out of the glue-containing cavity 10b due to the significant swing of the side plate 33.

[0071] In some examples, in the direction from the first substrate 21 to the second substrate 31, the cross-sectional area of the glue receiving cavity 10b gradually decreases. Exemplarily, the longitudinal section of the glue receiving cavity 10b can be "V"-shaped. The longitudinal section of the glue receiving cavity 10b is coplanar with the axis S of the receiving hole 23.

[0072] In some realizable ways, Figure 6 Schematically shows a partial exploded structure of the paper composite fastener 10. Refer to Figure 5 and Figure 6 As shown, the side plate 33 of the second convex portion 32 facing the outer surface 331 of the first convex portion 22 is an inclined surface. The inner surface 221 of the first convex portion 22 facing the side plate 33 is an inclined surface. The inner surface 221 of the first convex portion 22 is the hole wall of the receiving hole 23. The space between the outer surface 331 of the side plate 33 and the inner surface 221 of the first convex portion 22 can form the glue receiving cavity 10b.

[0073] The end of the first convex portion 22 away from the first substrate 21 is the top end. The closer to the top end of the first convex portion 22, the relatively smaller the aperture of the receiving hole 23. The small end of the receiving hole 23 is located at the top end of the first convex portion 22. The second convex portion 32 is inserted into the receiving hole 23 from the small end of the receiving hole 23. Since both the outer surface 331 of the side plate 33 of the second convex portion 32 and the inner surface 221 of the first convex portion 22 are inclined surfaces, during the process of inserting the second convex portion 32 into the receiving hole 23, after the side plate 33 passes through the small end of the receiving hole 23, it is not easy for the side plate 33 to come into contact with the first convex portion 22, so that it is not easy for a frictional resistance opposite to the insertion direction of the side plate 33 to appear between the side plate 33 and the first convex portion 22, which is beneficial to reducing the possibility that the side plate 33 is squeezed and collapses and deforms during the insertion process due to the side plate 33 being subjected to a large frictional resistance.

[0074] In addition, during the processing of the first paper fastener 20, the first paper fastener 20 can be formed by using a mold. The inner surface 221 of the first convex portion 22 being an inclined surface facilitates the demolding of the first paper fastener 20. During the processing of the second paper fastener 30, the second paper fastener 30 can be formed by using a mold. The outer surface 331 of the side plate 33 of the second convex portion 32 being an inclined surface facilitates the demolding of the second paper fastener 30.

[0075] In some examples, refer to Figure 6 As shown, the included angle between the inner surface 221 of the first convex portion 22 and the axis S of the receiving hole 23 is A1, where 2° ≤ A1 ≤ 8°. The included angle between the outer surface 331 of the side plate 33 and the axis S of the receiving hole 23 is A2, where 2° ≤ A2 ≤ 8°.

[0076] In some realizable ways, Figure 7 Schematically shows the structure of the paper composite fastener 10. Refer to Figure 6 andFigure 7 As shown, the top plate 34 includes an intermediate convex portion 341 protruding toward the second substrate 31. The intermediate convex portion 341 connects two relatively arranged side plates 33. Along the radial direction of the accommodation hole 23, the cavity 301 includes sub-cavities 3011 located on opposite sides of the intermediate convex portion 341.

[0077] The top plate 34 with the intermediate convex portion 341 can effectively bear the acting force in the axial P direction of the accommodation hole 23, and can also effectively bear the acting force in the radial direction of the accommodation hole 23, enabling the structure of the top plate 34 itself to have good load dispersion and conduction capabilities, and improving the overall mechanical strength and load-bearing performance of the top plate 34 itself. The axial P of the accommodation hole 23 is perpendicular to the radial direction of the accommodation hole 23.

[0078] The intermediate convex portion 341 of the top plate 34 can provide effective support for the side plates 33. The acting force borne by the side plates 33 can be dispersed and conducted through the intermediate convex portion 341 of the top plate 34, which is beneficial to improving the overall load-bearing performance of the side plates 33 themselves. Therefore, the second convex portion 32 formed by the top plate 34 with the intermediate convex portion 341 and the side plates 33 as a whole has good mechanical strength and load-bearing performance.

[0079] In addition, the sub-cavities 3011 on opposite sides of the intermediate convex portion 341 can serve as finger-holding positions, facilitating the operator to insert fingers to pick up and place the paper composite lock 10, and at the same time facilitating the application of an external force to the paper composite lock 10 to perform the connection operation or separation operation between the paper composite lock 10 and the box body. Exemplarily, during the assembly process of the paper composite lock 10 and the box body, the sub-cavities 3011 on the second paper fastener 30 can face the operator, facilitating the operator to accurately position the sub-cavities 3011, so as to improve the working efficiency of the connection operation or separation operation between the paper composite lock 10 and the box body.

[0080] In some examples, along the axial P of the accommodation hole 23, the intermediate convex portion 341 does not protrude from the second substrate 31. Exemplarily, the top surface of the intermediate convex portion 341 is lower than the surface of the second substrate 31 facing away from the first substrate 21. The top surface of the intermediate convex portion 341 is a plane. The side surface of the intermediate convex portion 341 facing the sub-cavity 3011 is a plane. There is a fillet transition between the top surface and the side surface of the intermediate convex portion 341, reducing the possibility of stress concentration at the corners of the intermediate convex portion 341.

[0081] In some examples, there is a fillet transition between the intermediate convex portion 341 and the side plates 33, reducing the possibility of stress concentration at the connection between the intermediate convex portion 341 and the side plates 33.

[0082] In some implementable ways, refer to Figure 6As shown, the middle convex portion 341 of the top plate 34 includes a concave cavity 3411. The concave cavity 3411 has an opening facing away from the second substrate 31. The top plate 34 isolates the concave cavity 3411 from the cavity 301. The concave cavity 3411 and the cavity 301 are respectively located on both sides of the top plate 34. The concave cavity 3411 is not connected to the cavity 301. The concave cavity 3411 is a blind hole structure. The concave cavity 3411 has only one opening. The middle convex portion 341 with the concave cavity 3411 is a hollow structure, which is beneficial to reducing the material usage of the top plate 34 and at the same time reducing the weight of the top plate 34.

[0083] In some examples, along the radial direction of the receiving hole 23, the concave cavity 3411 can penetrate through the side plate 33 connected to the middle convex portion 341.

[0084] In some examples, along the radial direction of the receiving hole 23, at least a part of the concave cavity 3411 is located between the two sub-cavities 3011.

[0085] In some realizable ways, the receiving hole 23 is a through hole, so that the first paper fastener 20 is a hollow structure. Along the thickness direction of the first substrate 21, the receiving hole 23 penetrates through the first substrate 21 and the first convex portion 22.

[0086] In some examples, the closer to the top end of the first convex portion 22, the relatively smaller the aperture of the receiving hole 23. The small-end of the receiving hole 23 is located at the top end of the first convex portion 22, while the large-end of the receiving hole 23 is close to the first substrate 21.

[0087] In some examples, the receiving hole 23 is a rectangular hole. The four top corners of the receiving hole 23 are rounded transition structures.

[0088] The part of the second convex portion 32 inserted into the receiving hole 23 can be restricted by the first convex portion 22, so that the part of the second convex portion 32 inserted into the receiving hole 23 cannot rotate within the receiving hole 23. When the adhesive 40 is filled between the first convex portion 22 and the second convex portion 32, the relative position between the first convex portion 22 and the second convex portion 32 is not likely to change, reducing the possibility that the second convex portion 32 drives the uncured adhesive 40 to flow due to the rotation of the second convex portion 32 relative to the first convex portion 22, thereby reducing the possibility of bubbles or poor curing inside the adhesive 40 due to the flow of the adhesive 40. The inner surface of the first convex portion 22 itself is the hole wall of the receiving hole 23. Therefore, the way that the four top corners of the receiving hole 23 are rounded transition structures makes the inner surface of the first convex portion 22 itself transition smoothly, reducing the possibility of stress concentration at the corners of the first convex portion 22.

[0089] In some examples, the cross-sectional shape of the first convex portion 22 is rectangular. The cross-section of the first convex portion 22 is perpendicular to the axis S of the receiving hole 23. The outer surface of the first convex portion 22 itself is an inclined surface. Exemplarily, the inner surface 221 and the outer surface of the first convex portion 22 are parallel to each other.

[0090] In some realizable ways, the first paper fastener 20 is an integral structure with uniform thickness. The thickness measured at any two positions on the first paper fastener 20 is the same. The second paper fastener 30 is an integral structure with uniform thickness. The thickness measured at any two positions on the second paper fastener 30 is the same.

[0091] In some realizable ways, the shapes of the first substrate 21 and the second substrate 31 are both rectangular frames. The card slot 10a between the first substrate 21 and the second substrate 31 is an annular groove. Along the axial direction P of the receiving hole 23, the outer contour of the orthographic projection of the first substrate 21 coincides with the outer contour of the orthographic projection of the second substrate 31.

[0092] In some realizable ways, Figure 8 Schematically shows a partial cross-sectional structure of the paper composite lock 10. Refer to Figure 7 and Figure 8 As shown, the shapes of the first substrate 21 and the second substrate 31 are both rectangular frames. Among them, the width of one side frame of the second substrate 31 is smaller than the width of the corresponding side frame on the first substrate 21, while the widths of the other three side frames of the second substrate 31 are equal to the widths of the corresponding side frames on the first substrate 21. The widths of the four side frames of the first substrate 21 are equal. The width of one side frame of the second substrate 31 is smaller than the width of any one of the other three side frames of the second substrate 31.

[0093] The side frame with a relatively small width on the second substrate 31 can be used to avoid other corresponding structural members, so as to effectively reduce the possibility of positional interference between the paper composite lock 10 and the corresponding structural members. In some examples, when the paper composite lock 10 is connected to the box body, the second substrate 31 can be located outside the box body, so that the second substrate 31 can face the operator, so that the operator can easily observe whether there is positional interference between the side frame with a relatively small width on the second substrate 31 and other corresponding structural members, and it is convenient to adjust the position of the paper composite lock 10 to avoid other corresponding structural members.

[0094] The above-mentioned paper composite lock 10 can be used in combination with corresponding mating structures to achieve locking and opening and closing. For example, as described below, it can be used for cardboard blanks with the following structures.

[0095] Figure 9 Schematically shows the structure of the cardboard blank. Refer to Figure 9As shown in the figure, an embodiment of the present application provides a cardboard blank 100 for connecting with a paper composite lock 10. The cardboard blank 100 is used for a carton. The cardboard blank 100 can form part of the structure of the carton. The cardboard blank 100 includes more than two cardboard sheets 110, a lock snap hole 101, and a lock avoidance hole 102.

[0096] More than two cardboard sheets 110 are stacked. Both the lock snap hole 101 and the lock avoidance hole 102 penetrate through the stacked area of the cardboard sheet 110. In the first direction X, the lock avoidance hole 102 is arranged on one side of the lock snap hole 101. The lock snap hole 101 and the lock avoidance hole 102 are communicated with each other. In the second direction Y, the maximum width of the lock snap hole 101 is smaller than the maximum width of the lock avoidance hole 102. The first direction X is perpendicular to the second direction Y. Both the first direction X and the second direction Y are perpendicular to the thickness direction of the cardboard sheet 110.

[0097] The paper composite lock 10 can switch back and forth between the lock snap hole 101 and the lock avoidance hole 102 to realize the switching between the locked state and the unlocked state of the stacked area, so that more than two cardboard sheets 110 are in a stacked state or an openable state.

[0098] Figure 10 Schematically show the connection process between the cardboard blank 100 and the paper composite lock 10. Figure 11 Schematically show the structure of the connection state between the cardboard blank 100 and the paper composite lock 10. Refer to Figure 9 、 Figure 10 and Figure 11 As shown, the structural design of the cardboard blank 100 can be adapted to the paper composite lock 10, so that the paper composite lock 10 can be used to lock or unlock each cardboard sheet 110 in the cardboard blank 100. In order to ensure that more than two cardboard sheets 110 do not become loose or spread out, the paper composite lock 10 is used to lock more than two cardboard sheets 110.

[0099] The connection process between the paper composite lock 10 and the cardboard blank 100 can be that, along the thickness direction of the cardboard 110, the paper composite lock 10 is integrally inserted into the lock avoidance hole 102. The first convex part 22 is aligned with the lock engaging hole 101 in the first direction X. The first convex part 22 slides towards the lock engaging hole 101 so that the first convex part 22 is snapped into the lock engaging hole 101, and the laminated area of the cardboard 110 is snapped into the card slot 10a of the paper composite lock 10. When the first convex part 22 completely slides into the lock engaging hole 101, the paper composite lock 10 is in a locked state. At this time, the paper composite lock 10 locks each cardboard 110, making each cardboard 110 in a stable laminated state, so that each cardboard 110 is not prone to looseness and dispersion. The first substrate 21 and the second substrate 31 of the paper composite lock 10 are respectively in an overlapping state with the cardboard 110. The cardboard 110 can be pressed against the first convex part 22 to form a limit constraint on the paper composite lock 10 through the first convex part 22, so that the paper composite lock 10 is not prone to shaking relative to the cardboard blank 100.

[0100] The separation process between the paper composite lock 10 and the cardboard blank 100 can be that the paper composite lock 10 is pushed along the first direction X, and the first convex part 22 slides out of the lock engaging hole 101. After the first convex part 22 completely slides out of the lock engaging hole 101, the paper composite lock 10 is integrally located in the lock avoidance hole 102. At this time, the paper composite lock 10 is in an unlocked state, so that each cardboard 110 is in a non-connected state, making each cardboard 110 in an openable state. Along the thickness direction of the cardboard 110, the paper composite lock 10 is integrally pulled out of the lock avoidance hole 102.

[0101] In some realizable ways, referring to Figure 10 and Figure 11 as shown, the cardboard blank 100 further includes a flip cover 120. The flip cover 120 is provided on the outermost one of more than two cardboards 110. The flip cover 120 opens or closes the lock avoidance hole 102. The shape of the flip cover 120 can match the shape of the lock avoidance hole 102.

[0102] Before the paper composite buckle 10 is connected to the cardboard blank 100, the flip cover 120 can be in a state of covering and locking the buckle avoidance hole 102, so that the flip cover 120 is located within the buckle avoidance hole 102, which helps to reduce the possibility of the flip cover 120 being scratched or pulled, resulting in tearing or damage of the flip cover 120. When the paper composite buckle 10 needs to be connected to the cardboard blank 100, the flip cover 120 opens the buckle avoidance hole 102, and then the paper composite buckle 10 can be inserted into the buckle avoidance hole 102 and slide into the buckle engaging hole 101 to complete the locking process. After the first convex portion 22 completely slides into the buckle engaging hole 101 and the paper composite buckle 10 is in the locked state, the flip cover 120 can cover the buckle avoidance hole 102 again. Thus, on the one hand, the flip cover 120 can play a role in limiting and constraining the paper composite buckle 10, reducing the possibility of the paper composite buckle 10 accidentally sliding out of the buckle engaging hole 101. On the other hand, the flip cover 120 can effectively block external dirt such as dust from passing through the buckle avoidance hole 102.

[0103] In some examples, the flip cover 120 and the corresponding cardboard 110 are of an integrally formed structure.

[0104] In some examples, a hole is provided in the middle area of the flip cover 120. An operator can insert a finger into the hole in the flip cover 120 to facilitate turning the flip cover 120 to open or cover the buckle avoidance hole 102.

[0105] In some examples, as shown in Figure 11 The shape of the second substrate 31 is a rectangular frame. The width of one side frame of the second substrate 31 is smaller than the width of any of the other three side frames of the second substrate 31. The side frame with a relatively small width on the second substrate 31 can be used to avoid the flip cover 120, effectively reducing the possibility of positional interference between the paper composite buckle 10 and the flip cover 120. When the paper composite buckle 10 is in the locked state, the flip cover 120 covering the buckle avoidance hole 102 can be aligned with the side frame with a relatively small width on the second substrate 31, so that the flip cover 120 can be relatively close to the first convex portion 22. Therefore, the distance between the flip cover 120 and the first convex portion 22 is relatively small. Thus, the flip cover 120 can play a role in limiting and constraining the first convex portion 22, and thereby play a role in limiting and constraining the paper composite buckle 10 through the first convex portion 22. The flip cover 120 can effectively reduce the movement amount of the first convex portion 22 in the first direction X, effectively reducing the possibility of the paper composite buckle 10 accidentally sliding out of the buckle engaging hole 101.

[0106] In some realizable ways, both the buckle engaging hole 101 and the buckle avoiding hole 102 are rectangular holes. In the second direction Y, the width of the buckle engaging hole 101 is smaller than the width of the buckle avoiding hole 102. The four top corners of the buckle engaging hole 101 and the four top corners of the buckle avoiding hole 102 are all rounded transition structures, which is beneficial to reducing the possibility of stress concentration at the corners of the buckle engaging hole 101 and the buckle avoiding hole 102 for each cardboard 110, and reducing the possibility of tearing and damage of the cardboard 110 due to the stress concentration area on the cardboard 110.

[0107] In some realizable ways, Figure 12 Schematically shows a partial exploded structure of the cardboard blank 100. Refer to Figure 12 As shown, the cardboard blank 100 may include two cardboards 110. For ease of description, the two cardboards 110 are respectively defined as the first plate member 111 and the second plate member 112. The first plate member 111 includes a first engaging hole 1111 and a first avoiding hole 1112. The second plate member 112 includes a second engaging hole 1121 and a second avoiding hole 1122. The size and shape of the first engaging hole 1111 are the same as those of the second engaging hole 1121. The size and shape of the first avoiding hole 1112 are the same as those of the second avoiding hole 1122. When the first plate member 111 and the second plate member 112 are stacked, the first engaging hole 1111 and the second engaging hole 1121 are aligned to form the buckle engaging hole 101. The first avoiding hole 1112 and the second avoiding hole 1122 are aligned to form the buckle avoiding hole 102. A flap 120 is provided on the second plate member 112. The flap 120 can be opened or closed to cover the second avoiding hole 1122.

[0108] Figure 13 Schematically shows the structure of the carton structural member. Refer to Figure 13 As shown, an embodiment of the present application provides a carton structural member 200. The carton structural member 200 is used to form a carton. The carton structural member 200 includes a cardboard blank 100 and a paper composite buckle 10.

[0109] The cardboard blank 100 includes more than two cardboard sheets 110, a locking snap hole 101, and a locking avoidance hole 102. More than two cardboard sheets 110 are stacked. Both the locking snap hole 101 and the locking avoidance hole 102 penetrate through the stacked area of the cardboard sheets 110. In the first direction X, the locking avoidance hole 102 is disposed on one side of the locking snap hole 101. The locking snap hole 101 and the locking avoidance hole 102 are in communication. In the second direction Y, the maximum width of the locking snap hole 101 is less than the maximum width of the locking avoidance hole 102. The first direction X is perpendicular to the second direction Y. The paper composite lock 10 can be integrally inserted into or pulled out of the locking avoidance hole 102 along the thickness direction of the cardboard sheet 110. After insertion, the paper composite lock 10 can enter the locking snap hole 101 from the locking avoidance hole 102, and the first convex portion 22 and the locking snap hole 101 can be slidably engaged in the first direction X. The first convex portion 22 is snapped into or out of the locking snap hole 101 to switch the paper composite lock 10 between the locked state and the unlocked state. In the locked state, the stacked area of the cardboard sheets 110 is snapped into the card slot 10a. In the unlocked state, the paper composite lock 10 is located in the locking avoidance hole 102 and can be pulled out through the locking avoidance hole 102.

[0110] In some realizable ways, when the paper composite lock 10 is connected to the cardboard blank 100, an operator can insert a finger into the two sub-chambers 3011 of the paper composite lock 10 to pick up the paper composite lock 10. Then the paper composite lock 10 is inserted into the locking avoidance hole 102. The operator slides the paper composite lock 10 to push the first convex portion 22 of the paper composite lock 10 into the locking snap hole 101. After sliding the paper composite lock 10 to a predetermined position, the finger is pulled out from the sub-chamber 3011. When the paper composite lock 10 is separated from the cardboard blank 100, the operator can insert a finger into the two sub-chambers 3011 of the paper composite lock 10, and the operator slides the paper composite lock 10 to slide the first convex portion 22 of the paper composite lock 10 out of the locking snap hole 101. After the paper composite lock 10 slides into the locking avoidance hole 102, the paper composite lock 10 is pulled out of the locking avoidance hole 102. After placing the paper composite lock 10 at a designated station, the finger is pulled out from the sub-chamber 3011.

[0111] The connection or separation process between the paper composite lock 10 and the cardboard blank 100 is simple and easy to operate, reducing the assembly difficulty and improving the assembly efficiency.

[0112] Figure 14 Schematically shows the structure of the cardboard box 300. Refer to Figure 14 As shown, an embodiment of the present application provides a cardboard box 300. The cardboard box 300 includes a cardboard box structural member 200. The cardboard box 300 of the embodiment of the present application can be used for packaging large products or heavy products. The cardboard box 300 can protect large products or heavy products.

[0113] In some feasible ways, the cardboard blank 100 can form at least one of the side box board, the top box board and the bottom box board of the carton structure 200, and the embodiments of the present application do not make specific limitations thereto.

[0114] In some feasible ways, more than two locking and clamping holes 101, locking avoidance holes 102 and paper composite locks 10 can be provided on one cardboard blank 100, which is beneficial to improving the connection strength and load-bearing performance between the stacked cardboard sheets 110. The locking and clamping holes 101, the locking avoidance holes 102 and the paper composite locks 10 are provided in one-to-one correspondence. More than two paper composite locks 10 can be arranged at intervals along the second direction Y.

[0115] In some feasible ways, the carton 300 can include a top box board and a bottom box board arranged oppositely. Both the top box board and the bottom box board include a cardboard blank 100 and a paper composite lock 10. The cardboard blank 100 includes two stacked cardboard sheets 110. After the carton 300 completes the wrapping work on the product to be packaged, the operator can quickly install or remove the paper composite lock 10 outside the carton 300, making the connection or separation process between the paper composite lock 10 and the cardboard blank 100 simple and easy to operate.

[0116] In some feasible ways, Figure 15 Schematically shows a partial cross-sectional structure of the carton 300. Refer to Figure 14 and Figure 15 As shown, the carton 300 can include a handle 400. The hand of the operator can be inserted into the central hole of the handle 400 to facilitate the handling of the carton 300 and the product. The handle 400 can include an inner buckle 401 and an outer buckle 402. The inner buckle 401 and the outer buckle 402 are respectively buckled and clamped with each other from the inside and outside of the carton 300 to complete the connection. Both the inner buckle 401 and the outer buckle 402 have central through holes. The material of the handle 400 can be plastic.

[0117] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and the components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A paper composite lock, characterized in that: include: An integrally formed first paper fastener comprises a first substrate, a first convex portion and a receiving hole, wherein the first substrate is connected to the first convex portion and the first substrate is disposed around the first convex portion; An integrally formed second paper fastener comprises a second substrate and a second convex portion, wherein the second convex portion comprises a side plate and a top plate, wherein the side plate and the top plate are combined to form a cavity, wherein the cavity has an opening corresponding to the top plate, and the second substrate is connected to the side plate and is disposed around the side plate; Among them, the second protrusion is plugged into the accommodating hole, the side plate is connected and fixed to the first protrusion, the first paper fastener and the second paper fastener are connected to form an integral structure, and the first substrate, the first protrusion and the second substrate are surrounded to form a card slot.

2. The paper composite lock according to claim 1, characterized in that: The side plate is bonded and fixed to the first protrusion.

3. The paper composite lock according to claim 2, characterized in that: A glue-containing cavity is formed between the side plate and the first protrusion, and the glue-containing cavity is filled with adhesive, and the adhesive bonds the side plate and the first protrusion.

4. The paper composite lock according to claim 3, characterized in that: In the direction from the first substrate to the second substrate, the cross-sectional area of ​​the glue containing cavity decreases, and the cross-sectional area of ​​the glue containing cavity is perpendicular to the axis of the containing hole.

5. The paper composite lock according to claim 4, characterized in that: The outer surface of the side plate facing the first protrusion is an inclined surface, and the inner surface of the first protrusion facing the side plate is an inclined surface.

6. The paper composite lock according to any one of claims 1 to 5, characterized in that: The top plate includes a middle convex portion protruding toward the second substrate, the middle convex portion connects the two side plates arranged oppositely, and along the radial direction of the accommodating hole, the cavity includes sub-chambers located on opposite sides of the middle convex portion.

7. The paper composite lock according to claim 6, characterized in that: The middle convex portion includes a concave cavity, the concave cavity has an opening facing away from the second substrate, the top plate separates the concave cavity from the cavity body, and the concave cavity is not connected to the cavity body.

8. The paper composite lock according to claim 1, characterized in that: The accommodating hole is a through hole, and along the thickness direction of the first substrate, the accommodating hole penetrates the first substrate and the first protrusion.

9. The paper composite lock according to claim 8, characterized in that: The accommodating hole is a rectangular hole, and the four top corners of the accommodating hole are rounded transition structures.

10. The paper composite lock according to any one of claims 1 to 5, characterized in that: The shapes of the first substrate and the second substrate are both rectangular frames, wherein the width of one frame of the second substrate is smaller than the width of the corresponding frame on the first substrate, and the widths of the remaining three frames of the second substrate are equal to the widths of the corresponding frames on the first substrate.

11. A cardboard blank for connecting with a paper composite lock, characterized in that: The paperboard blank comprises: Two or more cardboards, lock snap-on holes and lock snap-off holes; More than two cardboards are stacked, and the lock snap-in hole and the lock snap-in avoidance hole both penetrate the stacking area of ​​the cardboards. In a first direction, the lock snap-in avoidance hole is arranged on one side of the lock snap-in hole, and the lock snap-in hole and the lock snap-in avoidance hole are connected. In a second direction, the maximum width of the lock snap-in hole is smaller than the maximum width of the lock snap-in avoidance hole, and the first direction is perpendicular to the second direction.

12. The cardboard blank according to claim 11, characterized in that The paperboard blank also includes a flap, which is arranged on the outermost one of the two or more paperboards, and the flap opens or covers the lock avoidance hole.

13. The cardboard blank according to claim 11 or 12, characterized in that The lock buckle engaging hole and the lock buckle avoiding hole are both rectangular holes, and the four top corners of the lock buckle engaging hole and the four top corners of the lock buckle avoiding hole are both rounded transition structures.

14. A carton structural member, used for a carton, characterized in that: The carton structural member comprises: A cardboard blank, comprising more than two cardboards, a lock snap-in hole and a lock avoidance hole, wherein the more than two cardboards are stacked, the lock snap-in hole and the lock avoidance hole both penetrate the stacking area of ​​the cardboards, in a first direction, the lock avoidance hole is arranged on one side of the lock snap-in hole, the lock snap-in hole and the lock avoidance hole are connected, in a second direction, the maximum width of the lock snap-in hole is smaller than the maximum width of the lock avoidance hole, and the first direction is perpendicular to the second direction; The paper composite lock buckle as described in any one of claims 1 to 10 can be inserted into or pulled out of the lock buckle avoidance hole as a whole along the thickness direction of the paperboard. After insertion, the paper composite lock buckle can enter the lock buckle engaging hole from the lock buckle avoidance hole, and the first protrusion and the lock buckle engaging hole can be slidably matched in the first direction; the first protrusion is snapped into or slid out of the lock buckle engaging hole to switch the paper composite lock buckle between a locked state and an unlocked state. In the locked state, the stacked area of ​​the paperboard is snapped into the card slot, and in the unlocked state, the paper composite lock buckle is located in the lock buckle avoidance hole and can be pulled out through the lock buckle avoidance hole.

15. A carton, characterized in that: Comprising the carton structure as claimed in claim 14.

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