Carton with high stability during movement

Abstract

The application discloses a carton with high stability in movement, and belongs to the technical field of packaging. The carton comprises a box body, a left top plate, a right top plate, a left bottom plate, a right bottom plate, an encryption mechanism and a clamping mechanism. The left top plate, the right top plate, the left bottom plate and the right bottom plate are fixedly arranged on the box body and symmetrically distributed. The connecting plate is arranged, the limiting plate on the encryption clamp piece can be inserted into the limiting hole on the connecting plate, the left top plate and the right top plate can be connected through the connecting plate, the corresponding limiting piece is pulled, the limiting piece is separated from the encryption clamp piece, the encryption clamp piece can fall into the deep accommodating groove, the left top plate and the right top plate can be opened, if the limiting piece does not correspond, the encryption clamp piece falls into the shallow accommodating groove and is inserted into the limiting hole, the effect of encryption and locking is achieved, whether the carton is tried to be opened can be judged, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of packaging, and particularly relates to a paper box with high stability during movement. BACKGROUND

[0002] At present, most of the packaging methods for some easily broken and damaged products are to use traditional wooden boxes, plastics or foams. With the improvement of human awareness of ecological environment protection, the material source of wooden boxes is becoming increasingly scarce, and the utilization rate of wood is relatively low, and the cost is high. The wooden boxes made of wood have poor shock resistance, and the insect diseases of wood also affect the quality of the wooden boxes. The packaging made of plastics or foams is not easy to recycle, causing serious environmental pollution. Whether the packaging made of wood or plastic, the change of temperature will cause the deformation of the packaging. Common commodity packaging materials mostly use paper boxes because of low cost, light weight, easy loading and unloading, transportation, protection of goods from damage, paper boxes are the most widely used packaging products, and bear the important role of containing, protecting products and being beautiful. However, the existing paper boxes are mostly sealed by using adhesive tape, which can be easily removed to open the paper box, resulting in poor encryption of the paper box. Moreover, the adhesive tape on the paper box can be removed and re-pasted, which is not convenient for identifying whether the paper box is opened privately, and affects the safety of goods. SUMMARY

[0003] In order to solve the problems that the adhesive tape can be easily removed to open the paper box, resulting in poor encryption of the paper box, and the adhesive tape on the paper box can be removed and re-pasted, which is not convenient for identifying whether the paper box is opened privately, and affects the safety of goods, the present application aims to provide a paper box with high stability during movement to solve the above problems.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a paper box with high stability during movement, comprising a box body, a left top plate, a right top plate, a left bottom plate, a right bottom plate, an encryption mechanism and a clamping mechanism, the left top plate, the right top plate, the left bottom plate and the right bottom plate are fixedly arranged on the box body, and the left top plate, the right top plate, the left bottom plate and the right bottom plate are symmetrically distributed, the left top plate, the right top plate, the left bottom plate and the right bottom plate are integrally formed with the box body, the encryption mechanism and the clamping mechanism are arranged in the box body, and the encryption mechanism is connected with the left top plate and the right top plate.

[0005] The encryption mechanism includes a fixed block, a connecting plate, a limiting seat, four encryption clips, a limiting plate, multiple limiting protrusions, and multiple limiting pieces. The fixed block, connecting plate, limiting seat, four encryption clips, limiting plate, and multiple limiting pieces are all located inside the housing. The fixed block is fixedly connected to the left top plate, the connecting plate is fixedly connected to the fixed block, and the limiting seat is fixedly connected to the right top plate, with the limiting seat aligned with the connecting plate. A through hole is provided on the limiting seat, and the end of the connecting plate away from the fixed block slides through the through hole. Multiple limiting grooves and multiple receiving grooves are provided on the limiting seat, with at least two of the receiving grooves having different depths. The through hole is located between the multiple limiting grooves and multiple receiving grooves, and all of the multiple limiting grooves and multiple receiving grooves communicate with the through hole. The multiple limiting grooves respectively communicate with multiple receiving grooves. The slots are aligned, and the connecting plate has multiple limiting holes, which are aligned with multiple limiting grooves and multiple receiving grooves. The four encryption clips are slidably disposed in the multiple limiting grooves, and the multiple limiting clips are inserted into the four encryption clips. The right top plate has a strip hole, and the ends of the multiple limiting clips away from the encryption clips slide through the strip hole and are fixedly connected to multiple limiting protrusions. The multiple limiting protrusions are located directly above the right top plate. The limiting plate is rotatably disposed at the end of one of the encryption clips away from the limiting clip, and the limiting plate can only rotate within one angle. The limiting plate is slidably inserted into one of the limiting holes. The limiting plate and the four encryption clips can be slidably inserted into the multiple receiving grooves, and at least three encryption clips are inserted into the limiting holes.

[0006] In a preferred embodiment, a groove is provided on the right top plate, the groove is connected to the strip hole, and the ends of the plurality of limiting pieces away from the encryption clip are all located in the groove. A cover plate is slidably disposed in the groove, the cover plate is fixedly connected to the right top plate, and the plurality of limiting pieces are all located between the cover plate and the right top plate.

[0007] In a preferred embodiment, two inner shells are fixedly disposed inside the box, the two inner shells are symmetrically arranged, and two process holes are symmetrically opened on the box, the two process holes being respectively connected to the inner cavities of the two inner shells.

[0008] In a preferred embodiment, a mesh plate is also slidably disposed inside the box, the side wall of the mesh plate is in contact with the inner wall of the box, and the mesh plate is in contact with the left bottom plate and the right bottom plate.

[0009] In a preferred embodiment, one end of the mesh plate is located between the two inner shells, and the other end of the mesh plate is located directly above the two inner shells.

[0010] As a preferred implementation form, a base plate is further slidably arranged in the box body, and a side wall surface of the base plate is in contact with an inner wall surface of the box body.

[0011] As a preferred implementation form, the clamping mechanism comprises an inner cover and a plurality of limiting rings, the inner cover and the plurality of limiting rings are both slidably arranged in the box body, and the inner cover and the plurality of limiting rings are both located between the right top plate and the base plate, the plurality of limiting rings are all fixedly sleeved on the inner cover, and a plurality of annular grooves are formed in the box body, and the plurality of limiting rings can be respectively inserted into the plurality of annular grooves.

[0012] Compared with the prior art, the paper box with high stability during movement has the following beneficial effects:

[0013] The paper box with high stability during movement is provided with the connecting plate, so that the limiting plate on the encryption clamp can be inserted into the limiting hole on the connecting plate, the left top plate and the right top plate can be connected through the connecting plate, the corresponding limiting piece is pulled to separate the limiting piece from the encryption clamp, and then the encryption clamp can fall into the deeper accommodating groove, so that the left top plate and the right top plate can be opened, if the limiting piece does not correspond, the encryption clamp falls into the shallower accommodating groove and is inserted into the limiting hole, thereby achieving the encryption locking effect, and then it is convenient to judge whether the paper box is tried to be opened, and the safety is improved.

[0014] The paper box with high stability during movement is provided with the cover plate, so that the cover plate can shield the plurality of limiting pieces, and when the cover plate is packaged with the adhesive tape, the larger adhesive tape can be avoided to be adhered on the limiting piece, thereby avoiding the limiting piece from being pulled by mistake, and the stability is improved.

[0015] The paper box with high stability during movement is provided with the inner cover, the inner cover is pressed downward to drive the plurality of limiting rings to move downward, so that the limiting rings can be connected with the plurality of annular grooves, and after the inner cover slides downward, the distance between the inner cover and the left bottom plate and the right bottom plate is reduced, thereby facilitating clamping of the articles in the box body, avoiding shaking of the articles during movement, and improving the stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the present application;

[0018] Figure 3 It is a schematic diagram of the structure of A in the present application;

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the present application from another perspective;

[0020] Figure 5The structural schematic diagram of the structure of B amplification in the application;

[0021] Figure 6 The structural schematic diagram of the structure of the encryption mechanism in the application;

[0022] Figure 7 The structural schematic diagram of the structure of the limiting seat in the application;

[0023] Figure 8 The structural schematic diagram of the structure of the limiting seat in the application;

[0024] Figure 9 The structural schematic diagram of the structure of the connecting plate in the application.

[0025] In the figure: 1, box body; 2, left top plate; 3, right top plate; 4, left bottom plate; 5, right bottom plate; 6, encryption mechanism; 601, fixed block; 602, connecting plate; 603, limiting seat; 604, encryption clamping piece; 605, limiting plate; 606, limiting protrusion; 607, limiting piece; 608, perforation; 609, limiting groove; 6010, accommodating groove; 6011, limiting hole; 6012, strip-shaped hole; 7, clamping mechanism; 701, inner cover; 702, limiting ring; 703, annular groove; 8, recess; 9, cover plate; 10, embedded shell; 11, process hole; 12, mesh plate; 13, pad plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0027] Embodiment, please refer to Figures 1-9 The application provides a paper box with high stability during movement, which comprises a box body 1, a left top plate 2, a right top plate 3, a left bottom plate 4, a right bottom plate 5, an encryption mechanism 6 and a clamping mechanism 7. The left top plate 2, the right top plate 3, the left bottom plate 4 and the right bottom plate 5 are fixedly arranged on the box body 1 and symmetrically distributed, and the left top plate 2, the right top plate 3, the left bottom plate 4 and the right bottom plate 5 are integrally formed with the box body 1. The encryption mechanism 6 and the clamping mechanism 7 are arranged in the box body 1, and the encryption mechanism 6 is connected with the left top plate 2 and the right top plate 3.

[0028] In this embodiment, please refer to Figures 1-2 Or Figures 4-9The encryption mechanism 6 comprises a fixed block 601, a connecting plate 602, a limiting seat 603, four encryption clamping pieces 604, a limiting plate 605, a plurality of limiting protrusions 606 and a plurality of limiting pieces 607, the fixed block 601, the connecting plate 602, the limiting seat 603, the four encryption clamping pieces 604, the limiting plate 605 and the plurality of limiting pieces 607 are located in the box body 1, the fixed block 601 is fixedly connected with the left top plate 2, the connecting plate 602 is fixedly connected with the fixed block 601, the limiting seat 603 is fixedly connected with the right top plate 3, and the limiting seat 603 is aligned with the connecting plate 602, a through hole 608 is formed in the limiting seat 603, one end of the connecting plate 602, away from the fixed block 601, slides through the through hole 608, a plurality of limiting grooves 609 and a plurality of accommodating grooves 6010 are formed in the limiting seat 603, and the depths of at least two of the plurality of accommodating grooves 6010 are different, the through hole 608 is located between the plurality of limiting grooves 609 and the plurality of accommodating grooves 6010, and the plurality of limiting grooves 609 and the plurality of accommodating grooves 6010 are in communication with the through hole 608, the plurality of limiting grooves 609 are aligned with the plurality of accommodating grooves 6010 respectively, a plurality of limiting holes 6011 are formed in the connecting plate 602, the plurality of limiting holes 6011 are aligned with the plurality of limiting grooves 609 and the plurality of accommodating grooves 6010 respectively, the four encryption clamping pieces 604 are slidably arranged in the plurality of limiting grooves 609 respectively, the plurality of limiting pieces 607 are inserted into the four encryption clamping pieces 604 respectively, a strip-shaped hole 6012 is formed in the right top plate 3, one end of the plurality of limiting pieces 607, away from the encryption clamping pieces 604, slides through the strip-shaped hole 6012 and is fixedly connected with the plurality of limiting protrusions 606 respectively, the plurality of limiting protrusions 606 are located directly above the right top plate 3, the limiting plate 605 is rotatably arranged at one end of one of the encryption clamping pieces 604, away from the limiting piece 607, and the limiting plate 605 can only rotate within an angle, the limiting plate 605 is slidably inserted into one of the limiting holes 6011, the limiting plate 605 and the four encryption clamping pieces 604 can be slidably inserted into the plurality of accommodating grooves 6010, and at least three of the encryption clamping pieces 604 are inserted into the limiting hole 6011;

[0029] The article is placed in the box 1, and is located between the left top plate 2, the right top plate 3 and the left bottom plate 4, the right bottom plate 5, the left top plate 2 and the right top plate 3 are closed to cover the box 1, so that the connecting plate 602 can be inserted in the perforation 608 on the limiting seat 603, when the connecting plate 602 is inserted in the perforation 608, the limiting plate 605 on one of the encryption clamping pieces 604 can be pushed to rotate by the connecting plate 602, so that the limiting plate 605 can fall in one of the limiting holes 6011 on the connecting plate 602, if the left top plate 2 and the right top plate 3 are rotated to open, the connecting plate 602 will be pulled to move on the limiting seat 603, because one part of the limiting plate 605 is in contact with the bottom of the encryption clamping piece 604, the limiting plate 605 can be rotated to be perpendicular to the bottom of the encryption clamping piece 604 at most, so that the limiting plate 605 can be pinned on the connecting plate 602, so that the connecting plate 602 cannot be separated from the limiting seat 603, and the left top plate 2 and the right top plate 3 cannot be opened, among them, the limiting protrusion 606 can prevent the limiting piece 607 from falling completely into the box 1, pulling one of the limiting pieces 607 can make it separate from the encryption clamping piece 604, and then the encryption clamping piece 604 can fall downward, the limiting groove 609 is arranged to make the encryption clamping piece 604 slide linearly, so that the encryption clamping piece 604 can fall into the containing groove 6010, if the limiting piece 607 pulled corresponds to the encryption clamping piece 604 with the limiting plate 605, the encryption clamping piece 604 and the limiting plate 605 on it can fall into the deeper containing groove 6010 corresponding to it, and then the encryption clamping piece 604 and the limiting plate 605 can fall completely into the containing groove 6010, the limiting piece 607 is separated from the limiting hole 6011, that is, the connecting plate 602 can be removed from the perforation 608, if the limiting piece 607 pulled corresponds to the encryption clamping piece 604 without the limiting plate 605, the encryption clamping piece 604 falls through the limiting hole 6011 into the shallower containing groove 6010, when the encryption clamping piece 604 is located in the shallower containing groove 6010, the upper end thereof is still located in the limiting hole 6011, and then the connecting plate 602 can be limited, by selecting to pull multiple limiting pieces 607, the encryption effect can be achieved, and the security is improved;

[0030] In this embodiment, please refer to Figure 1 or Figures 4-5The right top plate 3 is provided with a groove 8, the groove 8 is communicated with the strip-shaped hole 6012, a plurality of limiting sheets 607 are located in the groove 8, the groove 8 is slidably provided with a cover plate 9, the cover plate 9 is fixedly connected with the right top plate 3, the plurality of limiting sheets 607 are located between the cover plate 9 and the right top plate 3, the cover plate 9 can shield the plurality of limiting sheets 607 by rotating the cover plate 9, so that the box 1, the left top plate 2, the right top plate 3, the left bottom plate 4 and the right bottom plate 5 are packaged by using the adhesive tape, thereby avoiding the adhesive tape from being bonded with the limiting sheet 607, avoiding the limiting sheet 607 from being pulled by mistake, and improving the stability and safety;

[0031] In this embodiment, please refer to Figures 1-2 The box 1 is fixedly provided with two embedded shells 10, the two embedded shells 10 are symmetrically arranged, the box 1 is symmetrically provided with two process holes 11, the two process holes 11 are respectively communicated with the inner cavities of the two embedded shells 10, the hand can be inserted into the embedded shell 10 through the process hole 11, thereby facilitating the carrying of the box 1, and the convenience is improved;

[0032] The box 1 is further slidably provided with a mesh plate 12, the side wall surface of the mesh plate 12 is in contact with the inner wall surface of the box 1, the mesh plate 12 is in contact with the left bottom plate 4 and the right bottom plate 5, the mesh plate 12 can increase the bearing capacity of the left bottom plate 4 and the right bottom plate 5, and the safety is improved;

[0033] One end of the mesh plate 12 is located between the two embedded shells 10, and the other end of the mesh plate 12 is located directly above the two embedded shells 10, so that the mesh plate 12 can be clamped above the embedded shell 10, avoiding the mesh plate 12 from being taken out from the bottom of the box 1, thereby avoiding the goods from being taken out from the bottom of the box 1;

[0034] The box 1 is further slidably provided with a pad plate 13, the side wall surface of the pad plate 13 is in contact with the inner wall surface of the box 1, the pad plate 13 is located directly above the mesh plate 12, and the pad plate 13 can increase the flatness of the mesh plate 12, avoiding the goods from falling into the gap of the mesh plate 12;

[0035] In this embodiment, please refer to Figures 2-3The clamping mechanism 7 comprises an inner cover 701 and a plurality of limiting rings 702, both of which are slidingly arranged in the box body 1 and located between the right top plate 3 and the cushion plate 13, and the plurality of limiting rings 702 are fixedly sleeved on the inner cover 701. A plurality of annular grooves 703 are formed in the box body 1, and the plurality of limiting rings 702 can be respectively inserted into the plurality of annular grooves 703. Pressing the inner cover 701 can drive the plurality of limiting rings 702 to move, so that the plurality of limiting rings 702 can be connected with the plurality of annular grooves 703, thereby facilitating the fixation of the inner cover 701 at different heights, adjusting the distance between the inner cover 701 and the cushion plate 13, and facilitating the clamping of the articles, improving the stability of the articles, and avoiding random shaking during movement.

[0036] Based on the above, the working principle of the present application is as follows:

[0037] In use, first, the box body 1, the left top plate 2, the right top plate 3, the left bottom plate 4 and the right bottom plate 5 are folded into a paper box with an upper opening, and the connection can be bonded with adhesive tape. Then, the mesh plate 12 is placed in the box body 1, so that it is located above the inner embedded shell 10, the left bottom plate 4 and the right bottom plate 5. Then, the cushion plate 13 is placed in the box body 1, so that it is located above the mesh plate 12. Then, the articles can be placed on the cushion plate 13, and the inner shell is pressed in the box body 1, so that the inner shell can clamp and fix the articles. Then, one end of the connecting plate 602 is inserted into the perforation 608, and the left top plate 2 and the right top plate 3 are rotated to cover the box body 1, so that the movement of the connecting plate 602 in the perforation 608 can push the limiting plate 605 to rotate, thereby enabling the limiting plate 605 to be inserted into the limiting hole 6011, thereby achieving the limiting effect. When opening, rotate the cover plate 9 to make the limiting piece 607 below it leak out, pull one of the limiting pieces 607 to separate it from the encryption clamping piece 604 above it. If the encryption clamping piece 604 corresponding to the limiting piece 607 has a limiting plate 605, the encryption clamping piece 604 will fall downward after being separated from the limiting piece 607, so that the encryption clamping piece 604 and the limiting plate 605 can fall into the deeper accommodating groove 6010, so that the limiting plate 605 is separated from the limiting hole 6011, and the connecting plate 602 can be taken out from the perforation 608. If the encryption clamping piece 604 corresponding to the limiting piece 607 does not have a limiting plate 605, the encryption clamping piece 604 will fall into the shallower accommodating groove 6010, so that one end of the encryption clamping piece 604 is still located in one of the limiting holes 6011, thereby preventing the removal of the connecting plate 602 and the opening of the box body 1.

[0038] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A cardboard box with high stability during movement, characterized in that: The enclosure includes a box body (1), a left top plate (2), a right top plate (3), a left bottom plate (4), a right bottom plate (5), an encryption mechanism (6), and a clamping mechanism (7). The left top plate (2), right top plate (3), left bottom plate (4), and right bottom plate (5) are all fixedly mounted on the box body (1), and the left top plate (2), right top plate (3), left bottom plate (4), and right bottom plate (5) are symmetrically distributed. The left top plate (2), right top plate (3), left bottom plate (4), and right bottom plate (5) are integrally formed with the box body (1). The encryption mechanism (6) and the clamping mechanism (7) are both located inside the box body (1). The encryption mechanism (6) is connected to the left top plate (2) and the right top plate (3). The encryption mechanism (6) includes a fixing block (601), a connecting plate (602), a limiting seat (603), four encryption clips (604), a limiting plate (605), multiple limiting protrusions (606), and multiple limiting pieces (607). The fixing block (601), connecting plate (602), limiting seat (603), four encryption clips (604), limiting plate (605), and multiple limiting pieces (607) are all located inside the housing (1). The fixing block (601) is fixedly connected to the left top plate (2), the connecting plate (602) is fixedly connected to the fixing block (601), and the limiting seat (603) is fixedly connected to the right top plate (3). The connection is made so that the limiting seat (603) is aligned with the connecting plate (602). The limiting seat (603) has a through hole (608). The end of the connecting plate (602) away from the fixing block (601) slides through the through hole (608). The limiting seat (603) has multiple limiting grooves (609) and multiple receiving grooves (6010), and at least two of the receiving grooves (6010) have different depths. The through hole (608) is located between the multiple limiting grooves (609) and the multiple receiving grooves (6010), and the multiple limiting grooves (609) and the multiple receiving grooves (6010) are all aligned with the through hole (608). The connection is made so that multiple limiting grooves (609) are aligned with multiple receiving grooves (6010) respectively. Multiple limiting holes (6011) are provided on the connecting plate (602), and the multiple limiting holes (6011) are aligned with multiple limiting grooves (609) and multiple receiving grooves (6010) respectively. Four encryption clips (604) are slidably disposed in multiple limiting grooves (609) respectively. Multiple limiting pieces (607) are inserted into the four encryption clips (604) respectively. A strip hole (6012) is provided on the right top plate (3), and the ends of multiple limiting pieces (607) away from the encryption clips (604) slide through the strip hole. (6012) and fixedly connected to multiple limiting protrusions (606) respectively. The multiple limiting protrusions (606) are located directly above the right top plate (3). The limiting plate (605) is rotatably disposed at one end of one of the encryption clips (604) away from the limiting piece (607). The limiting plate (605) can only rotate within one angle. The limiting plate (605) is slidably inserted into one of the limiting holes (6011). The limiting plate (605) and the four encryption clips (604) can be slidably inserted into multiple receiving slots (6010), and at least three encryption clips (604) are inserted into the limiting holes (6011).

2. A cardboard box with high stability during movement according to claim 1, characterized in that: A groove (8) is provided on the right top plate (3). The groove (8) is connected to the strip hole (6012). The ends of the multiple limiting pieces (607) away from the encryption clip (604) are all located in the groove (8). A cover plate (9) is slidably arranged in the groove (8). The cover plate (9) is fixedly connected to the right top plate (3). The multiple limiting pieces (607) are all located between the cover plate (9) and the right top plate (3).

3. A cardboard box with high stability during movement according to claim 1, characterized in that: The box (1) is fixedly provided with two inner shells (10), the two inner shells (10) are symmetrically arranged, and the box (1) is symmetrically provided with two process holes (11), the two process holes (11) are respectively connected to the inner cavity of the two inner shells (10).

4. A cardboard box with high stability during movement according to claim 3, characterized in that: A mesh plate (12) is also slidably arranged inside the box (1). The side wall of the mesh plate (12) is in contact with the inner wall of the box (1). The mesh plate (12) is in contact with the left bottom plate (4) and the right bottom plate (5).

5. A cardboard box with high stability during movement according to claim 4, characterized in that: One end of the mesh plate (12) is located between the two inner shells (10), and the other end of the mesh plate (12) is located directly above the two inner shells (10).

6. A cardboard box with high stability during movement according to claim 4, characterized in that: A pad (13) is also slidably disposed inside the box (1). The side wall of the pad (13) is in contact with the inner wall of the box (1). The pad (13) is located directly above the mesh plate (12).

7. A cardboard box with high stability during movement according to claim 1, characterized in that: The clamping mechanism (7) includes an inner cover (701) and multiple limiting rings (702). The inner cover (701) and multiple limiting rings (702) are slidably disposed in the box body (1), and the inner cover (701) and multiple limiting rings (702) are located between the right top plate (3) and the pad plate (13). The multiple limiting rings (702) are fixedly sleeved on the inner cover (701). Multiple annular grooves (703) are opened in the box body (1), and the multiple limiting rings (702) can be inserted into the multiple annular grooves (703) respectively.

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