A sealed packaging box

Abstract

The present invention discloses a sealed packaging box, comprising a box body and a box door fixed to the box body by a connecting assembly and sealing an opening on one side of the box body, a plurality of upper supports and a plurality of lower supports are respectively arranged on the top and bottom of the box body, the upper supports are hemispherical, and their plane ends are connected to the box body, the tops of the lower supports are connected to the box body, and their bottoms are concave and form a cavity; when stacking multiple packaging boxes, the packaging boxes are sequentially the first packaging box, the second packaging box... and the Nth packaging box from top to bottom, and the upper support of the Nth packaging box is inserted into the cavity of the N-1th packaging box. The stacking of boxes of the present invention adopts spherical positioning to ensure the precise positioning of the packaging boxes when stacking, prevent the center of gravity from shifting, and avoid the situation of tipping over due to excessive stacking height. It effectively reduces the risk of tipping over after the boxes are stacked, and ensures the safety of the products during loading and unloading, transportation, storage and use.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging boxes, and in particular to a sealed packaging box. Background Art

[0002] A packaging box is a box structure that is designed to facilitate transportation, loading and unloading, and storage. Certain special items need to be stored in a sealed container to ensure that the temperature and humidity of the storage environment meet the storage requirements.

[0003] The general structure of the packaging box is sealed by screws and gaskets. That is, sealing rings or sealing strips are provided at the box door and the box opening of the box body, and then the box door is fastened to the box body with screws so that the box opening is covered by the box door, and the sealing ring or sealing strip is compressed to achieve the sealing of the internal chamber of the box body.

[0004] Since this common sealed packaging box uses screws to fix the box door, it takes a lot of time to screw in or out the screws during the process of opening and closing the box door, which reduces the efficiency of the box door opening and closing and wastes unnecessary operation time. At the same time, when the boxes are stacked, the upper and lower packaging boxes only rely on surface contact and gravity to achieve vertical stability, and their stability is poor. The higher the stacking height, the greater the stacking error, so the greater the center of gravity offset, and the easier it is to tip over. Summary of the invention

[0005] The purpose of the present invention is to provide a sealed packaging box that solves the above-mentioned technical problems of poor stability and inconvenient door opening of existing sealed packaging boxes when stacking. The sealed packaging box designed by the present invention provides a structure for increasing the stacking stability between the stacked packaging boxes, thereby ensuring the precise positioning of the packaging boxes when stacking, preventing the center of gravity from shifting, and avoiding the situation of tipping over due to excessive stacking height.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A sealed packaging box, comprising a box body and a box door fixed to the box body by a connecting assembly and sealing an opening on one side of the box body, a plurality of upper supports and a plurality of lower supports are respectively arranged on the top and bottom of the box body, the upper supports are hemispherical, and the plane ends thereof are connected to the box body, the tops of the lower supports are connected to the box body, and the bottoms thereof are concave to form a cavity;

[0008] When stacking multiple packaging boxes, the packaging boxes are, from top to bottom, the first packaging box, the second packaging box, ..., and the Nth packaging box, and the upper support of the Nth packaging box is inserted into the cavity of the N-1th packaging box.

[0009] Furthermore, lock buckles are provided on a pair of opposite outer walls of the box body, and the movable part and the fixed part of the lock buckle are respectively fixed on the upper and lower sides of the outer wall of the box body;

[0010] When stacking a plurality of packaging boxes, the movable portion installed on the Nth packaging box is buckled with the fixed portion installed on the N-1th packaging box.

[0011] Furthermore, a frame structure is provided in the inner cavity of the box, the frame structure comprising a plurality of rectangular support rings, the support rings are evenly arranged in sequence along a straight line perpendicular to the back plate of the box, and the axis of the support ring is perpendicular to the back plate of the box, and the outer wall of the support ring is connected to the inner wall of the box;

[0012] A plurality of support bars A are arranged between two adjacent support rings. The axes of the support bars A are perpendicular to the back plate of the box body. The support bars A are evenly arranged in sequence along the circumference of the support rings, and both ends of the support bars A are connected to a support ring respectively.

[0013] Furthermore, a plurality of vertical support bars B and a plurality of horizontal support bars B are arranged on the inner side of the support ring closest to the back plate in the frame structure, and the vertical support bars B and the horizontal support bars B are crisscrossed in sequence, and the ends of the vertical support bars B and the horizontal support bars B are connected to the inner wall of the support ring.

[0014] Furthermore, the support ring, support bar A, vertical support bar B and horizontal support bar B are all U-shaped steel.

[0015] Furthermore, a plurality of trays are arranged from bottom to top on the inner side of the frame structure, the trays are parallel to the horizontal plane, and are slidably fixed on the support ring, and the sliding direction of the trays is perpendicular to the back plate of the box body;

[0016] The pull-out assembly includes a tray and a guide rail, the axis of the guide rail is perpendicular to the back plate of the box body, and there are two guide rails, which are located on both sides of the tray respectively. The guide rails are fixed on the inner wall of the support ring. The tray is parallel to the horizontal plane, and its two sides are respectively inserted into the guide groove of a guide rail.

[0017] Furthermore, the connection assembly includes a plurality of buckles, which are evenly distributed in sequence along the axis of the opening, the fixed plates of the buckles are fixed to the outer wall of the box body, and the movable plates of the buckles are fixed to the side walls of the box door.

[0018] Furthermore, the box door is hinged to the box body through a hinge mechanism.

[0019] Furthermore, a file box is arranged on the outer side wall of the box body.

[0020] Furthermore, a temperature and humidity meter is arranged on the box body, a dial of the temperature and humidity meter is fixed on the outer wall of the box body, and a collection end thereof is located in the inner cavity of the box body.

[0021] Due to the adoption of this technical solution, the beneficial effects of the present invention are:

[0022] 1. The sealed packaging box of the present invention adopts spherical positioning when stacking the boxes, which can ensure the accurate positioning of the packaging boxes when stacking, prevent the center of gravity from shifting, and avoid the situation where the stacking height is too large and the boxes fall down. It effectively reduces the risk of the boxes falling down after stacking, and ensures the safety of the products during loading and unloading, transportation, storage and use;

[0023] 2. In a sealed packaging box of the present invention, the lock buckle is arranged to increase the synchronization and stability between two adjacent packaging boxes in the vertical direction, thereby further reducing the risk of tipping over after the boxes are stacked; in particular, during transportation, the lock buckle is used to achieve efficient synchronization between the upper and lower packaging boxes, and relative movement cannot occur, thereby completely preventing the packaging box on the upper side from sliding relative to the packaging box on the lower side due to vibration or inertia during acceleration and deceleration, thereby ensuring the stability of the packaging box stacking;

[0024] 3. The sealed packaging box of the present invention is preferably designed to be a flat door through hinge connection according to the design requirements that the box door can be opened or closed quickly and remain firm after the box door is closed, and a wedge block self-locking device can be used to open and close the box door. The packaging box adopts the flat door mode to open and close the box door, and a buckle is used to fix the sealed box door, which greatly improves the efficiency of the box door opening and closing and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. The proportional relationship of each component in the drawings of this specification does not represent the proportional relationship in actual material selection and design, which is only a schematic diagram of the structure or position, where:

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the box door of the present invention when it is opened;

[0028] Figure 3 It is a schematic diagram of the structure of the tray being pulled out;

[0029] Figure 4 It is a structural diagram of the box;

[0030] Figure 5It is a structural diagram of the frame structure;

[0031] Figure 6 It is the main view of the frame structure;

[0032] Figure 7 is a structural diagram of the lower support;

[0033] Figure 8 is a structural diagram of the upper support;

[0034] Fig. 9 It is a fixed structure diagram of the temperature and humidity meter;

[0035] Fig.10 It is a structural diagram of the hinge mechanism;

[0036] Fig.11 It is a schematic diagram of the sealing structure between the box door and the box body;

[0037] Fig.12 It is a schematic diagram of the structure after stacking of the present invention.

[0038] Description of the reference numerals in the accompanying drawings:

[0039] 1-box body, 2-box door, 3-upper support, 4-lower support, 5-cavity, 6-movable part, 7-fixed part, 8-support ring, 9-support bar A, 10-vertical support bar B, 11-horizontal support bar B, 12-tray, 13-guide rail, 14-fixed plate, 15-movable plate, 16-hinge mechanism, 17-file box, 18-thermohygrometer, 19-box side panel, 20-industrial plexiglass, 21-O-ring, 22-rubber sheet, 23-thermohygrometer box body, 24-pressure cover, 25-screw, 26-sealing ring, 27-stop strip, 28-charging and discharging interface, 29-cylindrical pin, 30-adjusting screw. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0042] Unless otherwise specified, the "connection" in the present invention refers to conventional connection methods, such as integral forming, welding, riveting, etc. The specific connection method can be adaptively optimized according to conventional technical knowledge in this technical field. All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0043] Combine the following Figures 1 to 12 The present invention is described in detail.

[0044] Example 1

[0045] like Figure 1-Figure 12 As shown, a sealed packaging box of the present invention comprises a box body 1 and a box door 2 fixed on the box body 1 through a connecting assembly and sealing an opening on one side of the box body 1, a plurality of upper supports 3 and a plurality of lower supports 4 are respectively arranged on the top and bottom of the box body 1, the upper supports 3 are hemispherical, and the plane ends thereof are connected to the box body 1, the tops of the lower supports 4 are connected to the box body 1, and the bottoms thereof are concave to form a cavity 5;

[0046] When stacking multiple packaging boxes, the packaging boxes are, from top to bottom, the first packaging box, the second packaging box, ..., and the Nth packaging box, and the upper support 3 of the Nth packaging box is inserted into the cavity 5 of the N-1th packaging box.

[0047] The upper support 3 and the plurality of lower supports 4 can be formed integrally with the box body 1, or can be manufactured separately and then welded to the box body.

[0048] The cavity 5 may be a hemispherical structure cavity whose ball diameter is consistent with that of the upper support 3. When the upper support 3 of the Nth packaging box is inserted into the cavity 5 of the N-1th packaging box, the upper support 3 is inscribed in the cavity 5. A hole whose diameter is consistent with the ball diameter of the upper support 3 may also be used as a wall. When the upper support 3 of the Nth packaging box is inserted into the cavity 5 of the N-1th packaging box, the circumference of the upper support 3 passing through the sphere center is inscribed in the hole wall. Preferably, the upper support 3 and the cavity 5 are clearance-matched.

[0049] Compared with the existing box stacking that only relies on surface contact for vertical positioning, the box stacking in the present invention adopts spherical positioning to ensure the precise positioning of the packaging boxes during stacking, prevent their center of gravity from shifting, and avoid the situation where the stacking height is too large and tipping occurs. It effectively reduces the risk of tipping after box stacking and ensures the safety of products during loading and unloading, transportation, storage and use.

[0050] Example 2

[0051] This embodiment is based on the first embodiment and further improves the stacking stability of the packaging boxes.

[0052] like Figure 1-Figure 3 as well as Fig.12 As shown, in the present invention, lock buckles are provided on a pair of opposite outer walls of the box body 1, and the movable part 6 and the fixed part 7 of the lock buckle are respectively fixed on the upper and lower sides of the outer wall of the box body 1;

[0053] When stacking a plurality of packaging boxes, the movable portion 6 installed on the Nth packaging box is buckled with the fixed portion 7 installed on the N-1th packaging box.

[0054] The lock can be welded to the box body, and can also be fixed to the box body by means of screws and other components.

[0055] The lock is an object used to fasten two items. It consists of a movable part and a fixed part. The door and related parts can be closed and opened by combining and separating the movable part and the fixed part. In the present invention, the lock can be a conventional lock, preferably a spring lock. The spring in the spring lock applies a pre-tightening force to the stacked packaging boxes, further improving the stability of the stacking of the packaging boxes.

[0056] In the present invention, the lock is set to increase the synchronization and enhance the stability between two adjacent packaging boxes in the vertical direction, further reducing the risk of tipping over after the boxes are stacked; especially during transportation, the lock is used to achieve efficient synchronization between the upper and lower packaging boxes, and no relative movement occurs, thereby completely preventing the packaging box on the upper side from sliding relative to the packaging box on the lower side due to vibration or inertia during acceleration and deceleration, thereby ensuring the stability of the packaging box stacking.

[0057] At the same time, the stacked packaging boxes are fixed with locks, which are not only more stable than other parts such as ropes, but also quick and convenient to contact and lock, and easy to operate.

[0058] When it is necessary to move a sealed box individually, the movable part 6 is pried open, and then the buckle on the movable part 6 is removed from the fixed part 5 to release the lock of the buckle, so that the sealed box can be moved individually; when it is necessary to stack the sealed boxes, the packaging boxes are stacked in sequence from bottom to top, and the upper support 3 of the Nth packaging box is inserted into the cavity 5 of the N-1th packaging box; then the movable part 6 is rotated, and the buckle on the movable part 6 is set on the fixed part 5, and then the movable part 6 is pried open and moved away from the fixed part 5, so that the lock is in a locked state, so as to fix the sealed boxes in the stacked state.

[0059] Example 3

[0060] This embodiment is based on the above embodiment and further describes the load-bearing structure of the box body.

[0061] like Figure 2-Figure 6As shown, in the present invention, a frame structure is provided in the inner cavity of the box body 1, and the frame structure includes a plurality of rectangular support rings 8, and the support rings 8 are evenly arranged in sequence along a straight line perpendicular to the back plate of the box body 1, and the axis of the support ring 8 is perpendicular to the back plate of the box body 1, and the outer wall of the support ring 8 is connected to the inner wall of the box body 1;

[0062] A plurality of support bars A9 are arranged between two adjacent support rings 8 . The axis of the support bars A9 is perpendicular to the back plate of the box body 1 . The support bars A9 are evenly arranged in sequence along the circumference of the support ring 8 , and both ends of the support bars A9 are connected to one support ring 8 respectively.

[0063] Furthermore, a plurality of vertical support bars B10 and a plurality of horizontal support bars B11 are arranged on the inner side of the support ring 8 closest to the back plate in the frame structure. The vertical support bars B10 and the horizontal support bars B11 are crisscrossed in sequence, and the ends of the vertical support bars B10 and the horizontal support bars B11 are connected to the inner wall of the support ring 8.

[0064] Furthermore, the support ring 8, the support bar A9, the vertical support bar B10 and the horizontal support bar B11 are all U-shaped steels.

[0065] In actual use, the main design of the packaging box is to make the packaging box bear a load greater than or equal to 3000N. In order to reduce the weight of the packaging box itself, a 2mm "U"-shaped intermittent weld is selected to the inside of the box body 1 to form a frame to meet the load-bearing requirements. In order to ensure the sealing of the weld of the functional replacement metal sealing packaging box, argon arc welding is preferably used for welding. Control of weld quality: After the weld is completed, in order to ensure the weld quality, the weld is inspected according to the ASME Volume 8 PT inspection requirements.

[0066] Example 4

[0067] This embodiment is based on the above embodiments and describes the internal object bearing structure of the present invention.

[0068] like Figure 2-Figure 3 As shown, in the present invention, a plurality of trays 12 are arranged from bottom to top on the inner side of the frame structure, preferably two trays 12, the trays 12 are parallel to the horizontal plane, and are slidably fixed on the support ring 8, and the sliding direction of the trays 12 is perpendicular to the back plate of the box body 1;

[0069] Preferably, the tray 12 is slidably fixed on the support ring 8 by a guide rail 13, the axis of the guide rail 13 is perpendicular to the back plate of the box body 1, and there are two guide rails 13, which are respectively located on both sides of the tray 12. The guide rails 13 are fixed on the inner wall of the support ring 8. The tray 12 is parallel to the horizontal plane, and its two sides are respectively inserted into a guide groove of a guide rail 13. The guide rail 13 is preferably a heavy-duty guide rail.

[0070] EPE foam pads are placed in each tray. EPE foam is also called pearl cotton. They are taken out and put into the metal sealed packaging box of functional replacement parts in a drawer manner, and slots of corresponding product sizes are opened in the pearl cotton pads according to the layout diagram. In this way, the products can quickly and orderly find the corresponding products according to the layout diagram, take them out or put them back to the original position, making it convenient and quick to find the corresponding products for use.

[0071] The inner packaging can be easily taken out and put back through the tray and sliding connection.

[0072] When using a sealed packaging box to take out and place products, after opening the sealed packaging box, pull out the pearl cotton pads for placing the products, and find the corresponding products according to the product layout diagram for quick take out and placement.

[0073] Example 5

[0074] This embodiment further illustrates the connection between the box door and the box body.

[0075] like Figure 1-Figure 4 As shown, in the present invention, the connection assembly includes a plurality of buckles, which are evenly spaced in sequence along the axis of the opening, the fixed plate 14 of the buckle is fixed on the outer wall of the box body 1, and the movable plate 15 of the buckle is fixed on the side wall of the box door 2.

[0076] When the door needs to be opened, the movable plate 15 is moved, and then the buckle on the movable plate 15 is removed from the fixed plate 14 to release the lock of the buckle, thereby opening the door; when the door needs to be closed, the movable plate 15 is rotated, the buckle on the movable plate 15 is placed on the fixed plate 14, and then the movable plate 15 is moved away from the fixed plate 14 to put the buckle in a locked state, thereby sealing the door closed.

[0077] Furthermore, the box door 2 is hinged to the box body 1 via a hinge mechanism 16 .

[0078] According to the design requirements that the box door can be opened or closed quickly and remain firm after closing, it is preferably designed to be a flat door through a hinge connection, and a wedge block self-locking device can be used to open and close the box door. The packaging box adopts a flat door to open and close the box door, and a buckle is used to fix and seal the box door, which greatly improves the efficiency of the box door opening and closing and saves time.

[0079] Example 6

[0080] This embodiment is a further optimization of the present invention.

[0081] like Figure 1 As shown, in the present invention, a file box 17 is provided on the outer side wall of the box body 1 .

[0082] Furthermore, a thermometer and humidity meter 18 is provided on the box 1, the dial of which is fixed on the outer wall of the box 1, and the collection end thereof is located in the inner cavity of the box 1. Preferably, a charging and discharging interface is provided on the box to adjust the internal pressure of the box through the charging and discharging structure.

[0083] Installation of temperature and humidity meter 18 Fig. 9 As shown, a through hole for placing the thermometer and humidity meter 18 is opened on the side panel of the box 1, and the position on the frame structure opposite to the through hole is penetrated by the through hole; in order to protect the thermometer and humidity meter 18 and prevent the temperature and humidity from being damaged by vibration during transportation, the thermometer and humidity meter 18 is preferably installed in a thermometer and humidity meter box 23, and the thermometer and humidity meter dial is covered with industrial organic glass, and preferably an O-ring for shock absorption and sealing is set between the industrial organic glass and the thermometer and humidity meter box body, and a rubber plate 22 for shock absorption is set between the industrial organic glass and the surface of the thermometer and humidity meter 18. Then the thermometer and humidity meter box body 23 is welded or bonded to the through hole.

[0084] Example 7

[0085] This embodiment provides an implementation description of the sealing structure between the box door and the box body.

[0086] like Fig.11 As shown, sealing components are provided on the relative contactable surfaces between the box door and the box body, and the sealing components include a sealing ring 26 and a stopper strip 27. A limiting groove is provided on the sealing ring 26, and the shape and size of the limiting groove are consistent with the shape and size of the stopper strip 27. On the box door, the stopper strip 27 is connected to the box door, and the sealing strip 26 is buckled on the stopper strip 27 through the limiting groove; on the box body, the stopper strip 27 is connected to the box body, and the sealing ring 26 is buckled on the stopper strip 27 through the limiting groove. When the box door is closed, the sealing rings 26 in the two sealing components contact and squeeze each other, and the stopper strip prevents the sealing strip from exploding during the airtightness test, thereby ensuring the reliability of the sealing of the sealing strip.

[0087] Example 8

[0088] This embodiment is an illustration of one size of the packaging box designed by the present invention.

[0089] The raw material of the packaging box is preferably 304;

[0090] Packing box dimensions: 110×95×105 (cm);

[0091] Product weight: 240±5(Kg);

[0092] Operating environment temperature: 0℃~+50℃;

[0093] The operating environment humidity is not more than 95%, preferably 0% to 80%;

[0094] The air pressure in the box is 0.03MPa, and the vacuum degree is -0.02MPa;

[0095] The weight of items placed on the box pallet should not exceed 80Kg, and a two-layer pallet is preferably used.

[0096] 304 material is preferred over metal sealed packaging boxes made of ordinary carbon steel. 304 material has excellent anti-oxidation and corrosion resistance. When designing packaging boxes, relevant parts are electroplated, coated and other corresponding surface treatments to improve the adaptability of parts in the environment.

[0097] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by a person skilled in the art within the technical scope disclosed by the present invention without creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A sealed packaging box, comprising a box body (1) and a box door (2) fixed to the box body (1) by a connecting assembly and sealing an opening on one side of the box body (1), characterized in that: A plurality of upper supports (3) and a plurality of lower supports (4) are respectively arranged at the top and bottom of the box body (1); the upper supports (3) are hemispherical, and the planar ends thereof are connected to the box body (1); the tops of the lower supports (4) are connected to the box body (1), and the bottoms thereof are concave and form a cavity (5); when a plurality of packaging boxes are stacked, the packaging boxes are sequentially arranged from top to bottom in the order of the first packaging box, the second packaging box, ... and the Nth packaging box, and the upper supports (3) of the Nth packaging box are inserted into the cavity (5) of the N-1th packaging box; A through hole for placing a thermometer and humidity meter (18) is provided on the side plate of the box body (1), a thermometer and humidity meter box body (23) is welded or bonded to the through hole, a thermometer and humidity meter box body (23) is provided with a thermometer and humidity meter (18), an O-ring (21) for shock absorption and sealing is provided between the industrial organic glass and the thermometer and humidity meter box body, and a rubber plate (22) for shock absorption is provided between the industrial organic glass and the surface of the thermometer and humidity meter (18); Lock buckles are provided on a pair of opposite outer walls of the box body (1), and the movable part (6) and the fixed part (7) of the lock buckle are respectively fixed on the upper and lower sides of the outer wall of the box body (1); when a plurality of packaging boxes are stacked, the movable part (6) installed on the Nth packaging box is buckled with the fixed part (7) installed on the N-1th packaging box; A frame structure is provided in the inner cavity of the box body (1), the frame structure comprising a plurality of rectangular support rings (8), the support rings (8) being arranged uniformly and sequentially along a straight line perpendicular to the back plate of the box body (1), the axis of the support ring (8) being perpendicular to the back plate of the box body (1), and the outer wall of the support ring (8) being connected to the inner wall of the box body (1); a plurality of support bars A (9) are provided between two adjacent support rings (8), the axis of the support bar A (9) being perpendicular to the back plate of the box body (1), being arranged uniformly and sequentially along the circumference of the support ring (8), and having two ends each connected to a support ring (8); A plurality of vertical support bars B (10) and a plurality of horizontal support bars B (11) are arranged on the inner side of a support ring (8) closest to the back plate in the frame structure, wherein the vertical support bars B (10) and the horizontal support bars B (11) are crisscrossed in sequence, and the ends of the vertical support bars B (10) and the horizontal support bars B (11) are connected to the inner wall of the support ring (8); The support ring (8), support bar A (9), vertical support bar B (10) and horizontal support bar B (11) are all U-shaped steel; A plurality of trays (12) are arranged from bottom to top on the inner side of the frame structure, the trays (12) are parallel to the horizontal plane, are slidably fixed on the support ring (8), and the sliding direction of the trays (12) is perpendicular to the back plate of the box body (1); The connection assembly comprises a plurality of buckles, which are evenly spaced in sequence along the axis of the opening, the fixing plate (14) of the buckle is fixed on the outer wall of the box body (1), and the movable plate (15) of the buckle is fixed on the side wall of the box door (2); The box door (2) is hinged to the box body (1) via a hinge mechanism (16); A document box (17) is arranged on the outer side wall of the box body (1).

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