Corrugated carton with high bearing capacity for packaging parts

Abstract

The invention relates to a package, in particular to a high-bearing-capacity corrugated carton for packaging parts, and solves the problems that an existing packaging carton cannot meet the requirements that a customer needs to use a full carton structure for packaging, cannot use any wood component or plastic product, needs a small package inside, cannot cover the small package and the like. And under the condition that the weight of a single box is 450kg, six layers are required to be stacked, and the weight of the paper box needs to reach the loading and storage and transportation requirements of 2.25 tons, due to the fact that the parts are easy to deform and cannot participate in bearing, and the weight of the single box is 450kg. The high-bearing-capacity corrugated carton for part packaging comprises an outer carton body of a cuboid structure, and the outer carton body comprises an upper cover, a surrounding plate, a bottom support, N inner carton bodies of cuboid structures arranged in the outer carton body and connecting plates arranged in the inner carton bodies; the connecting plate is wrapped by the folding surfaces after being folded, so that the folding surface A, the folding surface B, the folding surface C and the folding surface D are fastened and connected after being folded.

Description

Technical Field

[0001] The present invention relates to a kind of packaging, specifically to a corrugated cardboard box for packaging parts with high load-bearing capacity. Background Art

[0002] At present, the "wood substitution with paper" plan has been widely promoted for the outer corrugated cardboard boxes of parts export packaging. Therefore, most of the outer corrugated cardboard boxes adopt heavy-duty corrugated cardboard boxes, whose general load-bearing capacity does not exceed 500 kg. If the load-bearing capacity needs to be increased, it is generally completed by methods such as parts participating in the load-bearing or adding wooden components inside. As a result, the weight of products loaded in the existing outer corrugated cardboard boxes does not exceed 800 kg.

[0003] Chinese Patent CN220810177U discloses "a high-density and high-load-bearing cardboard box". The designed high-density and high-load-bearing cardboard box achieves the effect of diagonal support through the first support plate, the second support plate, the inclined plate, the convex block, the concave block, the docking block, the storage groove and the card slot. Through the corrugated cardboard, the fixing plate and the spring, the compressive resistance effect and the load-bearing capacity are improved. Diagonal support is carried out inside the cardboard box, effectively preventing the cardboard box from deforming and making its stability stronger. Chinese Patent CN210592909U discloses "a packaging cardboard box with an integrated partition", which includes an outer cardboard box with a cuboid structure. A partition is arranged inside the outer cardboard box, and the partition divides the outer cardboard box into four independent accommodation spaces; the outer cardboard box and the partition are integrally formed by folding a single cardboard. It organically combines the traditional outer cardboard box and the partition, which is convenient for transportation and storage, and has the remarkable effect of simple box-forming operation. Moreover, it has better compressive resistance and anti-breakage effect than the partition inside the traditional outer cardboard box.

[0004] However, the above-mentioned packaging cardboard boxes cannot meet the requirements of customers that the packaging must use a full cardboard box structure, no wooden components or plastic products can be used, there should be small packages inside, the small packages cannot be covered, etc., and due to the easy deformation of the parts, they cannot participate in the load-bearing. In the case of a single-box weight of 450 kg, the stacking needs to reach 6 layers, and the load-bearing of the cardboard box needs to reach 2.25 tons for loading, storage and transportation requirements. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems that the existing packaging cardboard boxes cannot meet the requirements of customers that the packaging must use a full cardboard box structure, no wooden components or plastic products can be used, there should be small packages inside, the small packages cannot be covered, etc., and due to the easy deformation of the parts, they cannot participate in the load-bearing. In the case of a single-box weight of 450 kg, the stacking needs to reach 6 layers, and the load-bearing of the cardboard box needs to reach 2.25 tons for loading, storage and transportation requirements, and provides a corrugated cardboard box for packaging parts with high load-bearing capacity.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A corrugated paper box for parts packaging with high load-bearing capacity, comprising an outer paper box of a rectangular structure, the outer paper box comprising an upper cover, a surrounding board and a bottom support, and the special feature of the outer paper box is that: the outer paper box is made of corrugated paper;

[0008] It also includes N inner cartons with a rectangular structure arranged in the outer carton and a connecting plate arranged in the inner carton, N ≥ 2;

[0009] The inner carton includes a rectangular bottom plate and folding surfaces A, B, C and D respectively connected to the four sides of the bottom plate, wherein folding surface A and folding surface C are arranged opposite to each other and have the same structure; folding surface B and folding surface D are arranged opposite to each other and have the same structure; folding surface A, folding surface B, folding surface C, folding surface D and the bottom plate are folded from a piece of corrugated paper to form the inner carton; the length of the outer carton is an integer multiple of the length of the inner carton, the width is an integer multiple of the width of the inner carton, and the height is an integer multiple of the width of the inner carton; the unfolded length of the inner carton is y+4h, and the width is x+4h, wherein y is the length of the inner carton, x is the width of the inner carton, and h is the height of the inner carton;

[0010] A first folding line is respectively arranged between the folding surface A, the folding surface B, the folding surface C, the folding surface D and the bottom plate; a second folding line parallel to the corresponding first folding line is arranged along the middle of each of the folding surface A, the folding surface B, the folding surface C, and the folding surface D, and each folding surface is folded inwardly along the second folding line so that its outer side coincides with the corresponding first folding line, and ear-wrapped folding surfaces are respectively arranged on both sides of the folding surface B and the folding surface D, and a notch is arranged between the ear-wrapped folding surface and the adjacent folding surface A or folding surface C; the ear-wrapped folding surface is used to be wrapped by the folding surface A and the folding surface C after being folded;

[0011] The connecting plate is made of corrugated paper, including a main body with the same size as the bottom plate, two side plates respectively connected to the two short sides of the main body, and four side ears respectively connected to the two side edges of the two side plates; the main body, the side plates and the four side ears are in an I-shaped structure; fold lines are respectively arranged between the main body and the side plates, and between the side plates and the side ears; the main body is used to form the bottom of the inner carton together with the bottom plate, the side plates are used to be wrapped by the folding surface A and the folding surface C after folding, and the four side ears are used to be wrapped by the folding surface B and the folding surface D after folding, so that the folding surface A, the folding surface B, the folding surface C, and the folding surface D are tightly connected after folding.

[0012] Furthermore, it also includes a plurality of first insertion holes, a plurality of second insertion holes, a plurality of protrusions matched with the first insertion holes and the second insertion holes, and a plurality of card slots matched with the protrusions; the plurality of first insertion holes are respectively arranged on the four edges of the bottom plate; the plurality of second insertion holes are respectively arranged on the two short side edges of the main body; the plurality of card slots are arranged on the long side edges of the main body; the plurality of protrusions are respectively arranged on the outer sides of the folding surface A, the folding surface B, the folding surface C, and the folding surface D, for inserting the corresponding first insertion holes, the second insertion holes and the tenons into the corresponding card slots after folding.

[0013] Further, the folding surface A is divided into an outer auxiliary plate a1 and an inner auxiliary plate a2 by a second fold line; the folding surface B is divided into an outer auxiliary plate b1 and an inner auxiliary plate b2 by a second fold line; the folding surface C is divided into an outer auxiliary plate c1 and an inner auxiliary plate c2 by a second fold line; the folding surface D is divided into an outer auxiliary plate d1 and an inner auxiliary plate d2 by a second fold line; the ear folding surfaces are respectively arranged on the short sides in the width direction of the outer auxiliary plate b1 and the inner auxiliary plate b2, and on the short sides in the width direction of the outer auxiliary plate d1 and the inner auxiliary plate d2, and a slot is arranged between adjacent ear folding surfaces for easy folding; the protrusions are respectively arranged on the outer sides in the length direction of the inner auxiliary plate a2, the outer side in the length direction of the inner auxiliary plate b2, the outer side in the length direction of the inner auxiliary plate c2, and the outer side in the length direction of the inner auxiliary plate d2.

[0014] Further, a first handle is arranged on the surrounding plate; second handles are respectively arranged at positions corresponding to the first handle on the outer auxiliary plate a1 and the outer auxiliary plate c1; third handles are arranged at positions corresponding to the first handle on the inner auxiliary plate a2 and the inner auxiliary plate c2; fourth handles are arranged at positions corresponding to the first handle on the side plate; arc-shaped grooves adapted to the first handle are arranged on the outer sides of the ear folding surfaces away from the outer auxiliary plate b1, the inner auxiliary plate b2, the outer auxiliary plate d1, and the inner auxiliary plate d2 for leaving the handle position empty after folding.

[0015] Further, it also includes paper columns adapted to the four inner corners of the surrounding plate; the paper columns are formed into paper corner guards after folding a piece of corrugated paper.

[0016] Further, it also includes a first partition arranged between each layer of inner cartons and a second partition arranged on the topmost layer of inner cartons.

[0017] Further, the second partition is made of honeycomb cardboard.

[0018] Further, the height directions of the outer carton, the inner carton, and the connecting plate are all in the corrugation direction of the corrugated paper to improve the stacking strength of the carton.

[0019] Advantages of the present invention:

[0020] 1. For the corrugated carton for packaging parts with high load-bearing capacity of the present invention, the overall packaging box is divided into an inner carton and an outer carton. The inner carton is a new combined folding paper box without a lid, and the outer carton is a nested corrugated carton that can be placed in multiple layers, enabling the overall packaging box to meet higher loading, storage, and transportation requirements of the client.

[0021] 2. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention uses a connecting plate to firmly connect folding surfaces A, B, C, and D, and uses a plurality of protrusions to insert into the first insertion holes, second insertion holes and tenons into the slots after folding, realizing connection without staples and glue.

[0022] 3. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention, the folding surface A is divided into an outer auxiliary plate a1 and an inner auxiliary plate a2 by a second fold line, the folding surface B is divided into an outer auxiliary plate b1 and an inner auxiliary plate b2 by a second fold line, the folding surface C is divided into an outer auxiliary plate c1 and an inner auxiliary plate c2 by a second fold line, and the folding surface D is divided into an outer auxiliary plate d1 and an inner auxiliary plate d2 by a second fold line, so that each folding surface is a double-layer folding structure. When the connecting plate is placed in the space formed by the double-layer folding structure after folding, there can be five layers of cardboard on the two short sides and three layers of cardboard on the long side after forming the box, with extremely high edge compression load. The lidless structure of the inner cardboard box can achieve a load-bearing capacity of more than 40 kg.

[0023] 4. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention, the ear folding surface can leave the position of the buckle empty after folding. After the inner cardboard box and the connecting plate are folded into a box and placed in the outer cardboard box, there are five layers of cardboard at the buckle. Each inner cardboard box can hold products that can be manually carried within 20 kg, avoiding the risk of breakage at the buckle.

[0024] 5. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention, paper columns are also provided at the four inner corners of the surrounding board, which can increase the rigidity and stacking strength of the whole box, and honeycomb cardboard is placed on the top layer of the inner cardboard box to improve the overall compressive strength.

[0025] 6. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention combines the inner cardboard box with honeycomb cardboard, paper corner protectors, and outer cardboard box solutions, and is made of all-paper materials with extremely high load-bearing capacity. It can carry more than 2.5 tons without the need for product load-bearing.

[0026] 7. A corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention can be stacked up to 6 layers on-site as a whole, and the total stacking height reaches 3.6 meters. It can be used for direct stacking in a warehouse without shelves, has a wide range of applications, is convenient for waste treatment after unpacking, and has no wood, plastic and other products, meeting customer requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the outer cardboard box in an embodiment of a corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention;

[0028] Figure 2 is a schematic structural diagram of the inner cardboard box in an embodiment of a corrugated cardboard box for packaging parts with high load-bearing capacity according to the present invention;

[0029] Figure 3 It is a schematic structural diagram of the unfolded inner carton in an embodiment of a corrugated carton for packaging parts with high load - bearing capacity according to the present invention;

[0030] Figure 4 It is a schematic structural diagram of the unfolded connecting plate in an embodiment of a corrugated carton for packaging parts with high load - bearing capacity according to the present invention;

[0031] Figure 5 It is a schematic structural diagram of a paper corner protector in an embodiment of a corrugated carton for packaging parts with high load - bearing capacity according to the present invention;

[0032] Figure 6 It is a schematic structural diagram of the second partition board in an embodiment of a corrugated carton for packaging parts with high load - bearing capacity according to the present invention.

[0033] Explanation of reference numerals: 1 - outer carton, 11 - upper cover, 12 - surrounding board, 13 - bottom tray, 14 - first buckle; 2 - inner carton, 21 - bottom board, 22 - first insertion hole, 23 - notch, 24 - folding surface of the wrapping ear, 25 - protrusion, 26 - groove strip, 27 - second buckle, 28 - third buckle; 3 - connecting plate, 31 - body, 32 - side plate, 33 - side ear, 34 - second insertion hole, 35 - card slot, 36 - fourth buckle; 4 - paper column, 5 - second partition board. Detailed implementation manners

[0034] As Figure 1 、 Figure 2 shown, a corrugated carton for packaging parts with high load - bearing capacity includes a cuboid - structured outer carton 1, N inner cartons 2, and a connecting plate 3 arranged in the inner carton 2; the outer carton 1 is a corrugated carton with a cuboid structure, including an upper cover 11, a surrounding board 12, and a bottom tray 13, and the upper cover 11, the surrounding board 12, and the bottom tray 13 form an outer package; the inner carton 2 is arranged inside the outer carton 1, and N≥2.

[0035] As Figure 3As shown in the figure, the inner carton 2 is a cuboid structure, including a rectangular bottom plate 21 and folding surfaces A, B, C, and D respectively connected to the four sides of the bottom plate 21. Among them, the folding surface A and the folding surface C are oppositely arranged and have the same structure; the folding surface B and the folding surface D are oppositely arranged and have the same structure; the folding surfaces A, B, C, and D and the bottom plate 21 are formed into the inner carton 2 by folding a single corrugated paper; the length of the outer carton 1 is an integer multiple of the length of the inner carton 2, the width is an integer multiple of the width of the inner carton 2, and the height is an integer multiple of the width of the inner carton 2; first folding lines are respectively arranged between the folding surfaces A, B, C, D and the bottom plate 21; the folding surfaces A, B, C, D are each provided with a second folding line parallel to the corresponding first folding line along the middle thereof, and each folding surface is folded inward along the second folding line so that its outer side edge coincides with the corresponding first folding line. Wrapping ear folding surfaces 24 are respectively arranged on both sides of the folding surfaces B and D, and a notch 23 is arranged between the wrapping ear folding surface 24 and the adjacent folding surface A or folding surface C. The wrapping ear folding surface 24 is used to be wrapped by the folding surfaces A and C after folding.

[0036] As Figure 4 shown in the figure, the connecting plate 3 is made of corrugated paper, including a body 31 having the same size as the bottom plate 21, two side plates 32 respectively connected to the two short sides of the body 31, and four side ears 33 respectively connected to the two side edges of the two side plates 32; the body 31, the side plates 32 and the four side ears 33 are in an I-shaped structure; folding lines are respectively arranged between the body 31 and the side plates 32, and between the side plates 32 and the side ears 33; the body 31 is used to jointly form the bottom of the inner carton 2 with the bottom plate 21, the side plates 32 are used to be wrapped by the folding surfaces A and C after folding, and the four side ears 33 are used to be wrapped by the folding surfaces B and D after folding.

[0037] Preferably, a plurality of first insertion holes 22 are respectively arranged on the four edges of the bottom plate 21; a plurality of second insertion holes 34 are respectively arranged on the two short side edges of the body 31, and a plurality of card slots 35 are respectively arranged on the long side edges; the second insertion holes 34, the card slots 35 and the first insertion holes 22 have the same size; a plurality of protrusions 25 are respectively arranged on the outer side edges of the folding surfaces A, B, C, D, and are used to be inserted into the corresponding first insertion holes 22, second insertion holes 34 and be fastened in the corresponding card slots 35 after folding.

[0038] For greater firmness, the folding surface A of the present invention is divided into an outer auxiliary plate a1 and an inner auxiliary plate a2 by a second fold line; the folding surface B is divided into an outer auxiliary plate b1 and an inner auxiliary plate b2 by a second fold line; the folding surface C is divided into an outer auxiliary plate c1 and an inner auxiliary plate c2 by a second fold line; the folding surface D is divided into an outer auxiliary plate d1 and an inner auxiliary plate d2 by a second fold line, so that each folding surface is a double-layer folding structure. When the connecting plate 3 is placed into the space formed by the double-layer folding structure after folding, the folding surfaces A, B, C, and D can be connected more tightly. Furthermore, when the inner carton 2 is formed into a box, there are five layers of cardboard on the two short sides and three layers of cardboard on the long sides, increasing the strength. The ear folding surfaces 24 are respectively arranged on the short sides along the width direction of the outer auxiliary plate b1 and the inner auxiliary plate b2, and on the short sides along the width direction of the outer auxiliary plate d1 and the inner auxiliary plate d2. A groove strip 26 is arranged between adjacent ear folding surfaces 24 for easy folding. The protrusions 25 are respectively arranged on the outer sides along the length direction of the inner auxiliary plate a2, the inner auxiliary plate b2, the inner auxiliary plate c2, and the inner auxiliary plate d2. The protrusions 25 are used to be snapped into the corresponding card slots 35 for locking after folding, which is easy to operate and convenient for clamping and disassembling. In this embodiment, the unfolded length of the inner carton 2 is y + 4h + g, and the width is x + 4h + g, where y is the length of the inner carton 2, x is the width of the inner carton 2, h is the height of the inner carton 2, and g is the height of the protrusion 25, with a value of 30.

[0039] In this embodiment, a first handle 14 is arranged on the surrounding plate 12; second handles 27 are respectively arranged at positions corresponding to the first handle 14 on the outer auxiliary plate a1 and the outer auxiliary plate c1; third handles 28 are arranged at positions corresponding to the first handle 14 on the inner auxiliary plate a2 and the inner auxiliary plate c2; fourth handles 36 are arranged at positions corresponding to the first handle 14 on the side plate 32; and arc-shaped grooves adapted to the first handle 14 are arranged on the outer sides of the ear folding surfaces 24 away from the outer auxiliary plate b1, the inner auxiliary plate b2, the outer auxiliary plate d1, and the inner auxiliary plate d2 for leaving the handle position empty after folding. The first handle 14, the second handles 27, the third handles 28, and the fourth handles 36 are all convenient for consignment.

[0040] As Figure 5 , Figure 6As shown, paper columns 4 are also provided at the four inner corners of the enclosing board 12, enhancing the overall rigidity of the outer carton 1 and improving the stacking strength; the paper column 4 is formed by folding a single corrugated paper into a paper corner protector. A first partition is provided between each layer in the inner carton 2 to isolate the upper and lower inner cartons 2, making the force on the carton edges uniform; a second partition 5 is provided on the uppermost inner carton 2, and the second partition 5 is made of honeycomb cardboard, which can enhance the compressive strength of the whole box and also make the compressive force of the whole box more evenly distributed on the carton; in order to improve the stacking strength of the carton, the corrugation directions of the corrugated paper in the height directions of the outer carton 1, the inner carton 2 and the connecting plate 3 are all the corrugation directions of the corrugated paper. Multiple inner cartons 2 can be placed in the outer carton 1, and the inner cartons 2 of each layer are separated by ordinary cardboard, and a honeycomb cardboard is placed on the uppermost layer to improve the overall compressive strength.

[0041] A corrugated carton for packaging parts with high load-bearing capacity according to the present invention can meet higher loading, storage and transportation requirements of the client. It adopts a structure of an outer carton 1 + an inner carton 2 to form a combined folding carton. The inner carton 2 is a small carton without a lid, 300mm×400mm, which can be folded from a single corrugated paper without using glue or nailing, and is locked into a box after folding by its own structure. The carton edge can provide extremely high edge crush strength; the outer carton 1 adopts a nested box type, and paper corner protectors are added around the inside of the outer carton 1 by using 3A corrugated paper to form paper columns 4 for support, further improving the edge crush strength of the carton.

[0042] After being sealed, the outer carton 1 + the inner carton 2 as a whole can be stacked up to 6 layers, and the total stacking height reaches 3.6 meters. It can be directly stacked high in a warehouse without shelves, has a wide application range, is convenient for waste treatment after unpacking, and has no products such as wood and plastic, meeting the requirements of customers.

[0043] The specific steps of the assembly method of the corrugated carton for packaging parts with high load-bearing capacity according to the present invention are as follows:

[0044] 1. Assemble the inner carton 2:

[0045] 1.1. Unfold the box body of the inner carton 2, then lay the connecting plate 3 flat on the unfolded inner carton 2, and make the body 31 of the connecting plate 3 correspond to the bottom plate 21 of the inner carton 2.

[0046] 1.2. Fold the side plates 32 and the side ears 33 at 90° along the fold lines between the body 31 and the side plates 32 and between the side plates 32 and the side ears 33.

[0047] 1.3. Fold the outer auxiliary plates b1 and d1 at a 90° angle along the first fold line between them and the bottom plate 21 so that they are in contact with the side ears 33 of the connecting plate 3. After folding the inner auxiliary plates b2 and d2 inward by 180° along the second fold line, use the ear wrapping surface 24 to wrap the side ears 33 of the connecting plate 3, and then insert the protrusion 25 into the corresponding card slots 35 and the first insertion holes 22 to fix the body 31 on the bottom plate 21 of the inner carton 2;

[0048] 1.4. Fold the outer auxiliary plates a1 and c1 at a 90° angle along the first fold line between them and the bottom plate 21 so that they are in contact with the side plates 32 of the connecting plate 3. After folding the inner auxiliary plates a2 and c2 inward by 180° along the second fold line, wrap the side plates 32 of the connecting plate 3, and then insert the protrusion 25 into the corresponding second insertion holes 34 and the first insertion holes 22 to tightly connect the folding surfaces A, B, C, and D, and the folding of the inner carton 2 is completed;

[0049] 2. Assemble the outer carton 1:

[0050] 2.1. Place the bottom tray 13 of the outer carton 1 on the ground, then insert the side panels 12 into the bottom tray 13, and place the paper columns 4 around its inner perimeter;

[0051] 2.2. Place N inner cartons 2 inside the outer carton 1, and place a first partition on each layer until a second partition 5 is placed on the last layer;

[0052] 2.3. Cover the upper cover 11 on the second partition 5 and the side panels 12 and pack them to complete the packaging and folding.

Claims

1. A corrugated paper box for parts packaging with high load-bearing capacity, comprising an outer paper box (1) of a rectangular parallelepiped structure, wherein the outer paper box (1) comprises an upper cover (11), a surrounding plate (12) and a bottom support (13), characterized in that: The outer carton (1) is made of corrugated paper; It also includes N inner cartons (2) of a rectangular structure arranged in the outer carton (1) and a connecting plate (3) arranged in the inner carton (2), where N is greater than or equal to 2; The inner carton (2) comprises a rectangular bottom plate (21) and folding surfaces A, B, C and D respectively connected to the four sides of the bottom plate (21), wherein folding surface A and folding surface C are arranged opposite to each other and have the same structure; folding surface B and folding surface D are arranged opposite to each other and have the same structure; folding surface A, folding surface B, folding surface C, folding surface D and the bottom plate (21) are folded from a sheet of corrugated paper to form the inner carton (2); the length of the outer carton (1) is an integer multiple of the length of the inner carton (2), the width is an integer multiple of the width of the inner carton (2), and the height is an integer multiple of the width of the inner carton (2); the unfolded length of the inner carton (2) is y+4h, and the width is x+4h, wherein y is the length of the inner carton (2), x is the width of the inner carton (2), and h is the height of the inner carton (2); A first folding line is respectively arranged between the folding surface A, the folding surface B, the folding surface C, the folding surface D and the bottom plate (21); a second folding line parallel to the corresponding first folding line is arranged along the middle of each of the folding surface A, the folding surface B, the folding surface C, and the folding surface D, and each folding surface is folded inwardly along the second folding line so that its outer side coincides with the corresponding first folding line; an ear-wrapped folding surface (24) is respectively arranged on both side edges of the folding surface B and the folding surface D, and a notch (23) is arranged between the ear-wrapped folding surface (24) and the adjacent folding surface A or folding surface C; the ear-wrapped folding surface (24) is used to be wrapped by the folding surface A and the folding surface C after being folded; The connecting plate (3) is made of corrugated paper, and comprises a main body (31) of the same size as the bottom plate (21), two side plates (32) respectively connected to the two short sides of the main body (31), and four side ears (33) respectively connected to the two side edges of the two side plates (32); the main body (31), the side plates (32) and the four side ears (33) are in an I-shaped structure; fold lines are respectively arranged between the main body (31) and the side plates (32), and between the side plates (32) and the side ears (33); the main body (31) is used to form the bottom of the inner carton (2) together with the bottom plate (21); the side plates (32) are used to be wrapped by the folding surface A and the folding surface C after being folded; the four side ears (33) are used to be wrapped by the folding surface B and the folding surface D after being folded, so that the folding surface A, the folding surface B, the folding surface C, and the folding surface D are tightly connected after being folded.

2. The high-load-bearing corrugated paper box for parts packaging according to claim 1, characterized in that: It also includes a plurality of first insertion holes (22), a plurality of second insertion holes (34), a plurality of protrusions (25) matched with the first insertion holes (22) and the second insertion holes (34), and a plurality of slots (35) matched with the protrusions (25); A plurality of first insertion holes (22) are respectively arranged on four edges of the bottom plate (21); A plurality of second insertion holes (34) are respectively arranged on two short side edges of the body (31); A plurality of card slots (35) are arranged on the long side edges of the body (31); A plurality of protrusions (25) are respectively arranged on the outer sides of the folding surface A, the folding surface B, the folding surface C, and the folding surface D, and are used to be inserted into the corresponding first insertion hole (22), the second insertion hole (34), and the tenon is locked in the corresponding slot (35) after folding.

3. The high-load-bearing corrugated paper box for parts packaging according to claim 2, characterized in that: The folding surface A is divided into an outer auxiliary plate a1 and an inner auxiliary plate a2 by a second folding line; The folding surface B is divided into an outer auxiliary plate b1 and an inner auxiliary plate b2 by a second folding line; The folding surface C is divided into an outer auxiliary plate c1 and an inner auxiliary plate c2 by a second folding line; The folding surface D is divided into an outer auxiliary plate d1 and an inner auxiliary plate d2 by a second folding line; The ear-wrapped folding surfaces (24) are respectively arranged on the short sides of the outer auxiliary plate b1 and the inner auxiliary plate b2 in the width direction, and on the short sides of the outer auxiliary plate d1 and the inner auxiliary plate d2 in the width direction, and grooves (26) are arranged between adjacent ear-wrapped folding surfaces (24) to facilitate folding; The protrusions (25) are respectively arranged on the outer edge of the inner auxiliary plate a2 along the length direction, the outer edge of the inner auxiliary plate b2 along the length direction, the outer edge of the inner auxiliary plate c2 along the length direction, and the outer edge of the inner auxiliary plate d2 along the length direction.

4. The high-load-bearing corrugated paper box for parts packaging according to claim 3, characterized in that: The enclosure plate (12) is provided with a first buckle (14); Second buckles (27) are respectively provided at positions on the outer auxiliary plate a1 and the outer auxiliary plate c1 corresponding to the first buckles (14); A third buckle (28) is provided at a position on the inner auxiliary plate a2 and the inner auxiliary plate c2 corresponding to the first buckle (14); A fourth handle (36) is provided on the side plate (32) at a position corresponding to the first handle (14); An arc-shaped groove matched with the first buckle (14) is provided on the outer side of the ear-wrapped folding surface (24) away from the outer auxiliary plate b1, the inner auxiliary plate b2, the outer auxiliary plate d1, and the inner auxiliary plate d2, so as to leave a buckle position free after folding.

5. The high-load-bearing corrugated paper box for parts packaging according to claim 4, characterized in that: It also includes paper pillars (4) adapted to the four inner corners of the enclosure (12); The paper pillar (4) is formed by folding a piece of corrugated paper to form a paper corner protector.

6. The high-load-bearing corrugated paper box for parts packaging according to claim 5, characterized in that: It also comprises a first partition plate arranged between each layer of inner cartons (2) and a second partition plate (5) arranged on the uppermost layer of inner cartons (2).

7. The high-load-bearing corrugated paper box for parts packaging according to claim 6, characterized in that: The second partition (5) is made of honeycomb paperboard.

8. The high-load-bearing corrugated paper box for parts packaging according to claim 1, characterized in that: The height directions of the outer carton (1), the inner carton (2) and the connecting plate (3) are all in the corrugated direction of the corrugated paper, thereby improving the stacking strength of the carton.

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