CN115892668A - An expandable box - Google Patents

Abstract

The invention relates to an expandable packaging box, comprising: a box body, including a body bottom plate and several body side plates, the body bottom plate and several body side plates enclose the upper part of the box body and a body side opening The structure; the box cover, which is a bendable structure, is connected to the bottom plate of the body; the expansion part includes several expansion side plates connected in sequence, and the expansion side plates at the end can be plugged into the two openings of the side plate of the body The body side plate on the side forms an expansion area; wherein, the cover can wrap around the expansion part and the box body to form a closed packaging structure. The body bottom plate and the body side plate enclose a certain volume of packaging box. The expansion area is formed after the side panel is expanded, and the expansion side panel is inserted into the box body. Different insertion depths make the box have different volumes, so that the accommodation space can be adjusted to adapt to items of different sizes or quantities, improving packaging efficiency and reducing production. cost and reduce waste of resources.

Description

An expandable box

technical field

The invention relates to the technical field of packaging, in particular to an expandable packaging box.

Background technique

Packaging boxes have been widely used in various fields of life, and are indispensable in the transportation and sales of products. At present, most of the packaging boxes on the market have a fixed volume, and the products that need to be packaged are often of different sizes or the number of products that need to be packaged is not equal. In this case, it is often necessary to replace the packaging boxes of different specifications, or through Fill more air columns, foam or shredded paper strips, etc. to adapt to the product size or quantity, but this method often has high costs, low packaging efficiency, and waste of resources.

Contents of the invention

The technical problem to be solved by the present invention is to provide a packaging box with an expandable storage space, which can adjust the storage space to adapt to items of different sizes or quantities, improve packaging efficiency, reduce production costs, and reduce waste of resources.

In order to solve the above technical problems, the technical solution adopted by the present invention is: an expandable packaging box, comprising: a box body, including a body bottom plate and several body side plates, the body bottom plate and several body side plates The upper part of the box body and the side opening of the body are enclosed; the box cover, which is a bendable structure, is connected to the bottom plate of the body; The side panels can be inserted into the body side panels on both sides of the body side panel opening to form an expansion area; wherein, the cover can wrap around the expansion part and the box body to form a closed packaging structure.

Further, the several body side panels include two first body side panels at the ends and a second body side panel connected to the first body side panels, and the several expansion side panels include two second body side panels at the ends. An expansion side plate and a second expansion side plate connected to the first expansion side plate, a receiving space is formed on the first body side plate, and the first expansion side plate can be partially or completely plugged into the receiving space .

Further, the height of the first expansion side plate is slightly smaller than the height of the body side plate, and the upper side of the first body side plate is connected with a first body inner flap, and the first body inner flap faces the box body The inner part is folded and detachably connected to the body side plate or the body bottom plate to form the receiving space.

Further, the expansion part also includes an expansion bottom plate and a stopper plate, the expansion bottom plate and the expansion side plate enclose the upper side of the expansion part and a structure of an expansion side opening, and the stopper plate is along the extension The bottom plate protrudes and can be bent and connected to the extended bottom plate, the width of the stopper plate along the insertion direction is not greater than the width of the side plate of the body along the insertion direction, and the length of the stopper plate is not greater than the Extend the length of the backplane.

Further, the side of the first body inner flap facing the second body side plate is provided with a body connecting plate, and the upper side of the second body side plate is connected with a second body inner flap, and the second body inner flap is The flap is folded toward the inside of the box body, and the edge of the inner flap of the second body away from the side plate of the second body is detachably connected to the side plate of the second body or the bottom plate of the body, and the connecting plate of the body is closed In the gap between the side panel of the second body and the inner flap of the second body.

Further, the side of the body connecting plate and the second body inner flap facing the body bottom plate are respectively provided with a first body tongue and a second body tongue, and the connection between the second body side plate and the body bottom plate is opened. There are body slots matched with the first body tongue and the second body tongue, so that the body connecting plate and the second body inner flap are detachably fixed on the second body side plate and the body bottom plate.

Further, the first expanded side panel and the second expanded side panel are respectively connected with a first expanded inner flap and a second expanded inner flap, and the first expanded inner flap faces one side of the second expanded side panel. The side is provided with an expansion connection plate, the first expansion inner flap and the second expansion inner flap are folded inside the box body, and are plugged into the expansion bottom plate respectively, and the expansion connection plate is closed in the In the gap between the second expanded side panel and the second expanded inner flap.

Further, the expansion connection plate, the second expansion inner flap and the first expansion inner flap are respectively provided with a first expansion tongue, a second expansion tongue and a third expansion tongue, and the first expansion side There are second expansion slots and first expansion slots respectively at the joints between the board and the second expansion side plate and the expansion bottom plate, and the first expansion tongue and the second expansion tongue can be plugged into the first expansion In the slot, the second extension tongue and the third extension tongue can be plugged into the second extension slot.

Further, the several body side plates are two first body side plates located at the ends and one second body side plate connected between the two first body side plates, and the several body side plates The extended side plates are two first extended side plates located at the ends and one second extended side plate connected between the two first extended side plates, the second extended side plate is plugged into the In the receiving space, the first body side panel, the second body side panel, the body bottom panel, the first expansion side panel, the second expansion side panel and the lid enclose a rectangular closed packaging box.

Further, the box cover includes a first folded piece, a second folded piece, a third folded piece, a fourth folded piece, a fifth folded piece and a sixth folded piece connected in sequence, the second main body side panel, the The width of the second expansion side panel, the stopper panel, the first folding piece, the second folding piece, the fourth folding piece and the fifth folding piece are the same, the sum of the widths of the second folding piece and the third folding piece, The sum of the widths of the fifth folded piece and the sixth folded piece, the width of the body bottom plate and the width of the extended bottom plate are equal.

Further, both the box body and the extension part are of a one-piece structure, the first body side plate and the second body side plate are respectively connected to the body bottom plate, and the first body side plate and the second body side plate are connected to each other. The first expansion side plate and the second expansion side plate are respectively connected to the expansion bottom plate, and the first expansion side plate and the second expansion side plate are connected through the expansion connection plate connect.

Further, an ear plate is connected to the edge along the length direction of the third folded piece, and a double-sided film is pasted on the ear plate.

Further, a double-sided film is pasted on the edge of the sixth folded sheet.

Further, two parallel tooth lines that are easy to tear are set on the sixth folding sheet and between the double-sided adhesive film and the fifth folding sheet.

The beneficial effect of the present invention is that: the body bottom plate and the body side plate enclose a certain volume of packaging box, when the expansion side plate is inserted to form an expansion area, the expansion side plate is plugged into the box body, different insertion depths make the box have different The volume can be adjusted to accommodate items of different sizes or quantities, improving packaging efficiency, reducing production costs, and reducing waste of resources.

Description of drawings

Figure 1 is a schematic diagram of the unfolded structure of the packaging box;

Fig. 2 is a schematic structural diagram of an expanded state when the packaging box is opened according to Embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of the non-expanded state when the packaging box is opened according to Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of the expanded state structure of the packaging box according to Embodiment 1 of the present invention when it is closed;

Fig. 5 is a schematic diagram of the non-expanded state structure of the packaging box according to Embodiment 1 of the present invention when it is closed.

Label description:

1. Box body; 11. Body bottom plate; 12. Body side plate; 121. First body side plate; 122. Second body side plate; 13. First body inner folding plate; 14. Second body inner folding plate; 141, the second body tongue; 143, the body slot; 15, the body connecting plate; 151, the first body tongue; 3, the box cover; 31, the first folding piece; 32, the second folding piece; 33, the second Three folding pieces; 331, ear plate; 34, fourth folding piece; 35, fifth folding piece; 36, sixth folding piece; 361, tooth line; 5, expansion part; 51, expansion bottom plate; 511, stop plate ; 52, expansion side panel; 521, first expansion side panel; 522, second expansion side panel; 53, first expansion inner flap; 531, third expansion tongue; 532, second expansion slot; 54, The second expansion inner flap; 541, the second expansion tongue; 55, the expansion connection plate; 551, the first expansion tongue; 552, the first expansion slot.

Detailed ways

In order to describe the technical content of the present invention, the achieved objectives and effects in detail, the following will be described in conjunction with the embodiments and accompanying drawings.

The key idea of the present invention is:

Please refer to Fig. 1-Fig. 5, an expandable packaging box of the present invention includes: a box body 1, including a body bottom plate 11 and several body side plates 12, the body bottom plate 11 and several body sides The plate 12 encloses and forms the upper part of the box body 1 and the structure of a body side opening; the box cover 3 is a bendable structure connected to the bottom plate 11 of the body; the expansion part 5 includes several expansion side plates 52 connected in sequence, The expansion side plate 52 at the end can be inserted into the body side plate 12 on both sides of the opening of the body side plate 12 to form an expansion area; wherein, the cover can wrap around the extension part 5 and the box body 1, Form a closed packaging structure.

It can be seen from the above description that the beneficial effect of the present invention is that: the body bottom plate 11 and the body side plate 12 enclose a packaging box with a certain volume, and when the expansion side plate 52 is inserted, an expansion area is formed, and the expansion side plate 52 is plugged into the box body 1 In general, different insertion depths make the boxes have different volumes, so that the accommodation space can be adjusted to adapt to items of different sizes or quantities, improve packaging efficiency, reduce production costs, and reduce waste of resources.

Further, the several body side panels 12 include two first body side panels 121 at the ends and a second body side panel 122 connected to the first body side panels 121, and the several extension side panels 52 include two at the ends. Two first extended side plates 521 of the upper part and a second extended side plate 522 connected to the first extended side plate 521, a receiving space is formed on the first body side plate 121, and the first extended side plate 521 can Partially or completely plugged into the receiving space.

It can be seen from the above description that the first expansion side panel 521 can be partially or completely plugged into the receiving space, and the structures of different receiving spaces can be completed through simple plugging, and the packaging efficiency is high.

Further, the height of the first expansion side plate 521 is slightly smaller than the height of the body side plate, the upper side of the first body side plate 121 is connected with the first body inner flap 13, and the first body inner flap 13 13 is folded toward the inside of the box body and detachably connected to the body side plate or the body bottom plate 11 to form the receiving space.

From the above description, it can be known that the inner flap 13 of the first body is folded to the inside of the box body to form a receiving space, the plug-in structure is formed by the inner flap, the structure is simple, the shape of the whole box body is regular, the compression resistance is strong, and it is convenient for storage and transportation stacking .

Further, the expansion part 5 also includes an expansion bottom plate 51 and a stopper plate 511, the expansion bottom plate 51 and the expansion side plate 52 enclose the upper side of the expansion part 5 and a structure with an expansion side opening, the stopper plate 51 The baffle plate 511 protrudes along the extended bottom plate 51 and is bendably connected to the extended bottom plate 51. The width of the stopper plate 511 along the insertion direction is not greater than the width of the main body side plate along the insertion direction. The length of the stop plate 511 is not greater than the length of the extended bottom plate 51 .

It can be seen from the above description that when the packing box is in the expanded state, the stopper plate 511 fixes the insertion position. When the box is assembled, the stopper plate 511 forms a limit for the extension part 5, which is beneficial to grasp the extension part 5. When the box body receives a certain amount of extrusion, due to the blocking of the stop plate 511, the extension part 5 is not easily squeezed inward by force, thereby protecting the product in the box.

Further, a body connecting plate 15 is provided on the side of the first body inner flap 13 facing the second body side plate 122, and the second body inner flap 14 is connected to the upper side of the second body side plate 122, so that The second body inner flap 14 is folded toward the inside of the box body, and the edge of the second body inner flap 14 away from the second body side plate 122 is detachably connected to the second body side plate 122 or the body bottom plate 11 , the body connecting plate 15 is enclosed in the gap between the second body side plate 122 and the second body inner flap 14 .

It can be seen from the above description that the body connecting plate 15 is enclosed in the gap between the second body side plate 122 and the second body inner flap 14, so that the first body inner flap 13 can be detachably fixed, and the structure is simple. , the first body inner flap 13 is not easy to come out. In addition, the body connecting plate 15 forms a connection between the first body side plate 121 and the second body side plate 122. When the box body is disassembled, the first body side plate 121 and the second body side plate 122 are connected. The second body side panel 122 can be laid flat to reduce the space occupied by the box during transportation.

Further, the body connecting plate 15 and the second body inner flap 14 are respectively provided with a first body tongue 151 and a second body tongue 141 on one side facing the body bottom plate 11, and the second body side plate 122 and A body slot 143 matching the first body tongue 151 and the second body tongue 141 is opened at the joint of the body bottom plate 11, so that the body connecting plate 15 and the second body inner flap 14 are detachable It is fixed on the second body side plate 122 and the body bottom plate 11 .

It can be seen from the above description that the first body tongue 151 and the second body tongue 141 are inserted into the body slot 143 to fix the first body inner flap 13, the overall structure is simple and easy to operate, and the first body inner flap 13 and The detachable fixing of the inner flap 14 of the second body facilitates repeated use.

Further, the first expanded side panel 521 and the second expanded side panel 522 are respectively connected with a first expanded inner flap 53 and a second expanded inner flap 54, and the first expanded inner flap 53 faces the second expanded inner flap 53. One side of the extended side plate 522 is provided with an extended connecting plate 55, the first extended inner flap 53 and the second extended inner flap 54 are folded toward the inside of the box body, and are plugged into the extended bottom plate 51 respectively, The expansion connecting plate 55 is enclosed in the gap between the second expansion side plate 522 and the second expansion inner flap 54 .

It can be seen from the above description that the first expansion connecting plate 55 is enclosed in the gap between the second expansion side plate 522 and the second expansion inner flap 54, so that the first expansion inner flap 53 is detachably fixed, The structure is simple, and the first expansion inner flap 53 is not easy to come out. In addition, the expansion connection plate 55 forms a connection between the first expansion side plate 521 and the second expansion side plate 522. When the box body is disassembled, the first expansion side plate 521 and the second extended side panel 522 can be laid flat to reduce the occupied space when the box is transported.

Further, the expansion connecting plate 55 , the second expansion inner flap 54 and the first expansion inner flap 53 are respectively provided with a first expansion tongue 551 , a second expansion tongue 541 and a third expansion tongue 531 , The connection between the first expansion side plate 521 and the second expansion side plate 522 and the expansion bottom plate 51 is provided with a second expansion slot 532 and a first expansion slot 552 respectively, and the first expansion tongue 551 and the second The expansion tongue 541 can be inserted into the first expansion slot 552 , and the second expansion tongue 541 and the third expansion tongue 531 can be inserted into the second expansion slot 532 .

It can be seen from the above description that the first expansion tongue 551 and the second expansion tongue 541 are inserted into the first expansion slot 552 to fix the first expansion inner flap 53, and the third expansion tongue 531 is inserted into the second expansion slot 532. The second extended inner flap 54 is fixed, the overall structure is simple, easy to operate, and the detachable fixing of the first extended inner flap 53 and the second extended inner flap 54 is realized, which is conducive to repeated use.

Further, the several body side panels are two first body side panels 121 located at the ends and one second body side panel 122 connected between the two first body side panels 121, the number of The two expansion side plates 52 are two first expansion side plates 521 located at the ends and one second expansion side plate 522 connected between the two first expansion side plates 521, the second The expansion side plate 522 is plugged into the receiving space, so that the first body side plate 121, the second body side plate 122, the body bottom plate 11, the first expansion side plate 521, the second expansion side plate 522 and the box cover 3 surround Synthetic rectangular closed box.

Further, the box cover 3 includes a first folded piece 31, a second folded piece 32, a third folded piece 33, a fourth folded piece 34, a fifth folded piece 35 and a sixth folded piece 36 connected in sequence, the The second main body side panel 122, the second expansion side panel 522, the stopper panel 511, the first folding piece 31, the second folding piece 32, the fourth folding piece 34 and the fifth folding piece 35 have the same width, and the first folding piece 31 has the same width. The sum of the widths of the two folded pieces 32 and the third folded piece 33, the sum of the widths of the fifth folded piece 35 and the sixth folded piece 36, the width of the body bottom plate 11 and the width of the expanded bottom plate 51 are equal .

It can be seen from the above description that the width of the second body side panel 122, the second expansion side panel 522, the stopper panel 511, the first folding piece 31, the second folding piece 32, the fourth folding piece 34 and the fifth folding piece 35 is Same, the sum of the widths of the second folded piece 32 and the third folded piece 33, the sum of the widths of the fifth folded piece 35 and the sixth folded piece 36, the width of the body bottom plate 11 and the expanded The width of the bottom plate 51 is equal, so that the box cover 3 can be bent in accordance with the packing box in the expanded state and the non-expanded state, so that the box body is more fit when the lid is closed, and the operation is more convenient.

Further, the box body 1 and the extension part 5 are both one-piece structures, the first body side plate 121 and the second body side plate 122 are respectively connected to the body bottom plate 11, and the first body side plate 121 and the second body side plate 122 are respectively connected to the body bottom plate 11. The second body side plates 122 are connected through the body connecting plate 15, the first expansion side plate 521 and the second expansion side plate 522 are respectively connected to the expansion bottom plate 51, and the first expansion side plate 521 and the second expansion side plate 521 are connected to each other. The two expansion side plates 522 are connected through the expansion connection plate 55 .

It can be seen from the above description that when the product is not loaded, the box body 1 and the extension part 5 are in a one-piece structure after the box is opened, which is convenient for transportation and saves space.

Further, an ear plate 331 is connected to the edge of the third folded piece 33 along the length direction, and a double-sided adhesive tape is pasted on the ear plate 331 .

It can be seen from the above description that the ear plate 331 is attached to the side plate of the main body or the side plate of the extension through a double-sided film, so that the packaging is more compact and not easy to be squeezed and deformed.

Further, a double-sided film is pasted on the edge of the sixth folding piece 36 .

It can be known from the above description that the sixth folding piece 36 can be bonded to the box body by the double-sided tape, so that the box cover 3 is closed.

Further, two parallel tooth lines 361 that are easy to tear are provided on the sixth folding piece 36 and between the double-sided adhesive film and the fifth folding piece 35 .

It can be seen from the above description that the two parallel tooth lines 361 make opening the box more convenient.

Please refer to Fig. 1-Fig. 5, embodiment one of the present invention is:

The expandable packaging box of this embodiment includes a box body 1 , a box cover 3 and an extension 5 , the box cover 3 is connected to the box body 1 , and the whole and the extension 5 are one-piece structures. The box body 1 includes a quadrangular body bottom plate 11 and two first body side plates 121 and a second body side plate 122 respectively connected to the three sides of the body bottom plate 11, and the two first body side plates 121 are connected to the body bottom plate 11 on opposite sides. The first body side panel 121 and a second body side panel 122 are respectively connected with a first body inner flap 13 and a second body inner flap 14, and the first body inner flap 13 faces one side of the second body side panel 122 A body connecting plate 15 is connected. A first body tongue 151 and a second body tongue 141 are respectively provided on the body connecting plate 15 and the second body inner flap 14 . A body slot 143 is defined at the junction of the body bottom plate 11 and the second body side plate 122 .

The expansion part 5 includes a quadrangular body bottom plate 11 and two first expansion side plates 521 and a second expansion side plate 522 respectively connected to the three sides of the expansion bottom plate 51, and the two first expansion side plates 521 are connected to the body bottom plate 11 on opposite sides. The sides of the first expansion side plate 521 and the second expansion side plate 522 away from the expansion base plate 51 are respectively connected with a first expansion inner flap 53 and a second expansion inner flap 54, and the first expansion inner flap 53 faces toward the second expansion. One side of the side plate 522 is connected with an expansion connection plate 55 . The extension connecting plate 55 , the first extension inner flap 53 and the second extension inner flap 54 are respectively provided with a first extension tongue 551 , a third extension tongue 531 and a second extension tongue 541 . A first expansion slot 552 and a second expansion slot 532 are defined at the joints of the second expansion side plate 522 , the first expansion side plate 521 and the expansion bottom plate 51 , respectively.

The box cover 3 is connected to the side opposite to the second body side panel 122, which includes a first folded piece 31, a second folded piece 32, a third folded piece 33, a fourth folded piece 34, and a fifth folded piece connected in sequence. 35 and the sixth foldable piece 36, a fold line is arranged between the first foldable piece 31, the second foldable piece 32, the third foldable piece 33, the fourth foldable piece 34, the fifth foldable piece 35 and the sixth foldable piece 36, so that The lid 3 becomes a bendable structure. Edges of the first folding piece 31 are connected to the bottom plate 11 of the body. The second body side panel 122, the second expansion side panel 522, the stopper plate 511, the first folding piece 31, the second folding piece 32, the fourth folding piece 34 and the fifth folding piece 35 have the same width, and the second folding piece 32 It is equal to the sum of the width of the third folding piece 33, the sum of the widths of the fifth folding piece 35 and the sixth folding piece 36, the width of the bottom surface of the body and the width of the extended bottom surface, and the length of the stopper plate 511 and the extended bottom plate 51 is slightly shorter than that of the main body The length of the bottom plate 11 (the direction of length in the present invention is the direction from one first body side plate 121 to the other first body side plate 121, and the direction of width is the direction perpendicular to the length direction). An ear plate 331 is connected to the edge of the third folded piece 33 along the length direction, and a double-sided film is pasted on the ear plate 331 . A double-sided film is pasted on the edge of the sixth folding piece 36 , and two parallel tooth lines 361 that are easy to tear are provided on the sixth folding piece 36 and between the double-sided film and the fifth folding piece 35 .

When the product is in use, the first body side panel 121 and the second body side panel 122 are turned up 90° along the fold line, and the first body inner flap 13 is turned inward, so that the first body inner flap 13 is far away from the first body. The edge of the side plate 121 of the body faces the bottom plate 11 of the body inside the box, the connecting plate 15 of the body is bent by 90° and fitted to the side plate 122 of the second body, and the tongue 151 of the first body is inserted into the slot 143 of the body. Fold the second body side plate 122 inward, and insert the second body tongue 141 into the body slot 143, and then the body connecting plate 15 is closed to the second body side plate 122 and the second body inner flap 14 to form In the gap, the first body side plate 121 and the second body side plate 122 are connected and fixed. There is a wider fold line between the first body side panel 121 and the first body inner flap 13 , so that there is a receiving space between the first body side panel 121 and the first body inner flap 13 . The body bottom plate 11 , the first body side plate 121 and the second body side plate 122 enclose the upper part of the box body 1 and a body side opening structure.

Fold the extension part 5 in a similar manner, fold the first expansion side panel 521 and the second expansion side panel 522 upwards by 90° along the fold line, and fold the first expansion inner flap 53 inward to make the first expansion inner fold The edge of the plate 53 away from the first expansion side plate 521 faces the expansion bottom plate 51 inside the box, the third expansion tongue 531 on the first expansion inner flap 53 is plugged into the second expansion slot 532, and the expansion connecting plate 55 is bent. Fold 90° and fit the second expansion side panel 522 , and insert the first expansion tongue 551 into the first expansion slot 552 . Fold the second expansion side plate 522 inward, and insert the second expansion tongue 541 into the first expansion slot 552, and then the expansion connecting plate 55 is closed by the second expansion side plate 522 and the second expansion inner flap 54, the first expansion side plate 521 and the second expansion side plate 522 are connected and fixed. The expansion bottom plate 51 , the first expansion side plate 521 and the second expansion side plate 522 enclose and form a structure with an expanded upper part of the box and an expanded side opening.

Insert the two first extension side plates 521 at the ends into the receiving space on the first body side plate 121 on both sides of the body side plate opening, and insert the stopper plate 511 and the expansion bottom plate 51 into the body bottom plate 11 In the combined body, an expansion area is formed, and the cover wraps around the expansion part 5 and the box body 1 to form a closed cuboid packaging structure. At this time, the packaging box is a structure with a large accommodating space (as shown in Figure 3). When it is necessary to pack smaller or fewer products, it is only necessary to fold the stop plate 511 into the inside of the expansion part 5, and then insert it into the box body 1, and form a package with a small accommodating space as shown in Figure 5 box.

The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in related technical fields, are all included in the same principle. Within the scope of patent protection of the present invention.

Claims (14)

1. An expandable packing box, characterized in that, comprising: The box body (1) includes a body bottom plate (11) and several body side plates (12), and the body bottom plate (11) and several body side plates (12) enclose to form the upper part of the box body (1) and a structure with an opening on the side of the body; The box cover (3), which is a bendable structure, is connected to the body bottom plate (11); The expansion part (5) includes several expansion side plates (52) connected in sequence, and the expansion side plates (52) at the end can be plugged into the body side plates (12) on both sides of the opening of the body side plate (12) ), forming an expansion area; Wherein, the cover body can wrap around the extension part (5) and the box body (1) to form a closed packaging structure. 2. The expandable packaging box according to claim 1, characterized in that, several body side panels (12) include two first body side panels (121) at the ends and are connected to the first body The second body side plate (122) of the side plate (121), several expansion side plates (52) include two first expansion side plates (521) positioned at the end and the first expansion side plate (521) connected to the The second expansion side plate (522), the first body side plate (121) is formed with a receiving space, and the first expansion side plate (521) can be partially or completely plugged into the receiving space. 3. The expandable packaging box according to claim 2, characterized in that, the height of the first expansion side panel (521) is slightly smaller than the height of the body side panel (12), and the first body side panel ( The upper side of 121) is connected with a first body inner flap (13), and the first body inner flap (13) is folded inside the box body and is detachably connected to the body side plate (12) or the body bottom plate (11) , forming the receiving space. 4. The expandable packaging box according to claim 3, characterized in that, the extension part (5) further comprises an expansion base plate (51) and a stopper plate (511), and the expansion base plate (51) and the The expansion side plate (52) encloses and forms the upper side of the expansion part (5) and an expansion side opening structure, and the stopper plate (511) protrudes along the expansion bottom plate (51) and is bendably connected to the On the extended bottom plate (51), the width of the stop plate (511) along the insertion direction is not greater than the width of the body side plate (12) along the insertion direction, and the length of the stop plate (511) is not greater than The length of the extended bottom plate (51). 5. The expandable packaging box according to claim 4, characterized in that, the side of the first body inner flap (13) facing the second body side plate (122) is provided with a body connecting plate (15) , the upper side of the second body side plate (122) is connected with a second body inner flap (14), the second body inner flap (14) is turned inside the box body, and the second body inner fold The edge of the plate (14) away from the second body side plate (122) is detachably connected to the second body side plate (122) or the body bottom plate (11), and the body connecting plate (15) is closed in In the gap between the second body side panel (122) and the second body inner flap (14). 6. The expandable packaging box according to claim 5, characterized in that, the body connecting plate (15) and the second body inner flap (14) are respectively provided with a first A body tongue (151) and a second body tongue (141), the joint of the second body side plate (122) and the body bottom plate (11) is provided with the first body tongue (151) and the body bottom plate (11). The second body tongue (141) matches the body slot (143), so that the body connecting plate (15) and the second body inner flap (14) are detachably fixed to the second body side plate (122) And on the body bottom plate (11). 7. The expandable packaging box according to claim 4, characterized in that, the first expansion side panel (521) and the second expansion side panel (522) are respectively connected with a first expansion inner flap (53 ) and the second expansion inner flap (54), the first expansion inner flap (53) is provided with an expansion connection plate (55) on the side facing the second expansion side plate (522), the first expansion inner The folded plate (53) and the second extended inner folded plate (54) are folded inside the box body, and are respectively plugged into the extended bottom plate (51), and the extended connecting plate (55) is enclosed by the second expanded connecting plate (55). In the gap between the two expanded side panels (522) and the second expanded inner flap (54). 8. The expandable packaging box according to claim 7, characterized in that, the expansion connecting plate (55), the second expansion inner flap (54) and the first expansion inner flap (53) are respectively set There are a first expansion tongue (551), a second expansion tongue (541) and a third expansion tongue (531), and the first expansion side plate (521) and the second expansion side plate (522) are connected with the expansion bottom plate The connection of (51) is provided with second expansion slot (532) and first expansion slot (552) respectively, and described first expansion tongue (551) and second expansion tongue (541) can be plugged in In the first expansion slot (552), the second expansion tongue (541) and the third expansion tongue (531) can be plugged into the second expansion slot (532). 9. The expandable packaging box according to claim 8, characterized in that, the several body side panels (12) are two first body side panels (121) located at the ends and one connected to The second body side plate (122) between the two first body side plates (121), and the several expansion side plates (52) are two first expansion side plates (521) located at the ends ) and a second expansion side plate (522) connected between two first expansion side plates (521), the second expansion side plate (522) is plugged into the receiving space, so that the first One body side plate (121), the second body side plate (122), the body bottom plate (11), the first expansion side plate (521), the second expansion side plate (522) and the box cover (3) are surrounded into a rectangle Close the box. 10. The expandable packaging box according to claim 9, characterized in that, the box cover (3) comprises a first folded piece (31), a second folded piece (32), and a third folded piece connected in sequence (33), the fourth folding sheet (34), the fifth folding sheet (35) and the sixth folding sheet (36), the second body side panel (122), the second expansion side panel (522), The stop plate (511), the first folded piece (31), the second folded piece (32), the fourth folded piece (34) and the fifth folded piece (35) have the same width, and the second folded piece (32) and the sum of the widths of the third folded piece (33), the sum of the widths of the fifth folded piece (35) and the sixth folded piece (36), the width of the body bottom plate (11) and the expansion bottom plate (51) are of equal width. 11. The expandable packaging box according to any one of claims 1-10, characterized in that, both the box body (1) and the extension part (5) are of a one-piece structure, and the side of the first body The plate (121) and the second body side plate (122) are respectively connected to the body bottom plate (11), and the body connection plate is passed between the first body side plate (121) and the second body side plate (122). (15) connection, the first expansion side plate (521) and the second expansion side plate (522) are respectively connected to the expansion bottom plate (51), and the first expansion side plate (521) and the second expansion side plate (522) are connected through the expansion connection board (55). 12. The expandable packaging box according to claim 11, characterized in that, the edge along the length direction of the third folding piece (33) is connected with an ear plate (331), and the ear plate (331) is Laminated with double-sided film. 13. The expandable packaging box according to claim 11, characterized in that, a double-sided film is pasted on the edge of the sixth folding sheet (36). 14. The expandable packaging box according to claim 11, characterized in that an easy-to-tear opening is provided on the sixth folding sheet (36) and between the double-sided film and the fifth folding sheet (35). Two parallel tooth lines (361).

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