A weld-hidden load-bearing frame and storage and transportation box

Abstract

The present invention relates to a load-bearing frame with hidden welds and a storage and transportation box. The load-bearing frame with hidden welds includes: a frame body, which is a groove-shaped structure, and the groove bottom of the frame body is used to adapt to the outer surface of the box body; a main body welding hole, which is arranged on the groove bottom of the frame body; and a main body cover plate, which is separately fixedly connected to the frame body to cover the frame body. When the frame body is placed on the outer surface of the box body, the groove bottom of the frame body is adapted to the outer surface of the box body; welding is performed at the edge of the main body welding hole to weld the frame body to the box body, and at this time, a weld is formed at the edge of the main body welding hole; after the main body cover plate is separately fixedly connected to the frame body, the main body cover plate covers the frame body to cover the weld inside the frame body, so that the weld will not be exposed, thereby improving the aesthetics of the storage and transportation box.

Description

Technical Field

[0001] The invention relates to a weld-hidden type load-bearing frame and a storage and transportation box. Background Art

[0002] With the continuous development of the level of militarization at home and abroad, various types of military airborne equipment are being used more and more widely. During the storage and transportation of airborne equipment, they are generally placed in special storage and transportation boxes, and often need to be sealed for storage. Therefore, the storage and transportation boxes of various types of airborne equipment are becoming more and more important.

[0003] In the prior art, the storage and transportation boxes of airborne equipment are generally thin plate box structures, mostly made of metal. The storage and transportation boxes are transported by air, sea, rail and other means, and require multiple forklift, hoisting, stacking and other processes. Therefore, the storage and transportation boxes need to have a certain strength.

[0004] In order to make the storage box meet certain strength requirements, a load-bearing frame (i.e., reinforcement ribs) is generally welded on the surface of the box. If the load-bearing frame is welded on the inner surface of the box, although the weld is not exposed, the load-bearing frame will occupy the space inside the box and will be unfavorable for the installation of airborne equipment; if the load-bearing frame is welded on the outer surface of the box, the load-bearing frame will not occupy the space inside the box, which is conducive to the installation of airborne equipment, but the weld will be exposed on the outside of the box, affecting the aesthetics of the storage box. Summary of the invention

[0005] The purpose of the present invention is to provide a load-bearing frame with hidden welds, so as to solve the technical problem in the prior art that when the load-bearing frame is welded to the outer surface of the box, the welds will be exposed on the outside of the box and affect the aesthetics of the storage and transportation box; the purpose of the present invention is also to provide a storage and transportation box using the above-mentioned load-bearing frame with hidden welds.

[0006] To achieve the above purpose, the technical solution of the weld hidden type load-bearing frame of the present invention is:

[0007] Welded hidden load-bearing frame, including:

[0008] The frame body is a groove-shaped structure, and the groove bottom of the frame body is used to adapt to the outer surface of the box body;

[0009] The main body welding hole is arranged on the groove bottom of the frame body;

[0010] The main body cover plate is separately fixedly connected to the frame body to cover the frame body.

[0011] The beneficial effect is that when the frame body is placed on the outer surface of the box, the groove bottom of the frame body is matched with the outer surface of the box. The frame body is welded to the box by welding at the edge of the main body welding hole, and at this time, a weld is formed at the edge of the main body welding hole. After the main body cover is separately fixedly connected to the frame body, the main body cover covers the frame body to cover the weld inside the frame body, so that the weld will not be exposed, thereby improving the aesthetics of the storage and transportation box.

[0012] As a further improvement, the auxiliary frame is a groove-shaped structure, and the groove bottom of the auxiliary frame is used to adapt to the outer surface of the box body;

[0013] Auxiliary welding holes are arranged on the bottom of the slot of the auxiliary frame;

[0014] An auxiliary cover plate is separately fixedly connected to the auxiliary frame to cover the auxiliary frame;

[0015] The flexible corner protection structure comprises a flexible body, wherein the flexible body is an arc-shaped structure;

[0016] The auxiliary frame and the frame body are perpendicular to each other, and the flexible corner protection structure is connected between the auxiliary frame and the frame body.

[0017] The beneficial effects are: the frame body and the auxiliary frame are arranged outside the box body, which improves the strength of the box body. At the same time, the structure of the split weld hidden load-bearing frame is simple and easy to process. The flexible body plays a role of buffering and protecting the box body, which can prevent damage caused by accidental falling of the box body.

[0018] As a further improvement, the flexible corner protection structure further includes a connecting piece, which is integrally formed with the flexible body, and the flexible corner protection structure is connected between the auxiliary frame and the frame body via the connecting piece.

[0019] The beneficial effect is that the connecting piece connects the auxiliary frame and the frame body, connects the auxiliary frame and the frame body into one, increases the strength of the weld-hidden load-bearing frame, and ensures the stability of the flexible corner protection structure.

[0020] As a further improvement, a sealing plate is provided at one end of the auxiliary frame away from the flexible corner protection structure.

[0021] The beneficial effect is that such a design prevents foreign matter from entering the auxiliary frame.

[0022] As a further improvement, the main body cover is detachably fixedly connected to the frame body, and the auxiliary cover is detachably fixedly connected to the auxiliary frame.

[0023] The beneficial effect is that the main cover plate and the auxiliary cover plate are detachable and can be directly replaced after being worn, which is convenient for later maintenance.

[0024] As a further improvement, a clamping structure is provided between the main cover plate and the frame body, and between the auxiliary cover plate and the auxiliary frame.

[0025] The beneficial effects are: the clamping structure is simple in structure, and is convenient for installation and removal between the main cover plate and the frame body, and between the auxiliary cover plate and the auxiliary frame.

[0026] As a further improvement, the snap-fit ​​structure includes a snap-fit ​​groove and a snap-fit ​​protrusion, and the snap-fit ​​groove is an open structure at at least one end in its extension direction, so that the snap-fit ​​protrusion can be pushed into the open end of the snap-fit ​​groove, thereby realizing the snap-fitting of the snap-fit ​​groove and the snap-fit ​​protrusion together.

[0027] The beneficial effect is that when used as a load-bearing frame, the frame body, the main body cover plate, the auxiliary cover plate and the auxiliary frame are generally made of metal, so that the snap-fitting protrusion is pushed in from the open end of the snap-fitting groove, which is conducive to snap-fitting and fixing.

[0028] As a further improvement, an avoidance groove is also provided at the bottom of the groove of the frame body, and the avoidance groove is used to avoid the longitudinal reinforcement on the outer surface of the box body.

[0029] The beneficial effect is that it is suitable for the case where the outer surface of the box body has longitudinal ribs.

[0030] As a further improvement, the main body cover is detachably fixedly connected to the frame body.

[0031] The beneficial effect is that the main body cover is detachable and can be directly replaced after being worn, which is convenient for later maintenance.

[0032] To achieve the above-mentioned purpose, the technical solution of the storage and transportation box of the present invention is:

[0033] The storage and transportation box comprises a box body, and a weld-hidden load-bearing frame is welded on the outer surface of the box body;

[0034] Welded hidden load-bearing frame, including:

[0035] The frame body is a groove-shaped structure, and the groove bottom of the frame body is used to adapt to the outer surface of the box body;

[0036] The main body welding hole is arranged on the groove bottom of the frame body;

[0037] The main body cover plate is separately fixedly connected to the frame body to cover the frame body.

[0038] The beneficial effect is that when the frame body is placed on the outer surface of the box, the groove bottom of the frame body is matched with the outer surface of the box. The frame body is welded to the box by welding at the edge of the main body welding hole, and at this time, a weld is formed at the edge of the main body welding hole. After the main body cover is separately fixedly connected to the frame body, the main body cover covers the frame body to cover the weld inside the frame body, so that the weld will not be exposed, thereby improving the aesthetics of the storage and transportation box.

[0039] As a further improvement, the auxiliary frame is a groove-shaped structure, and the groove bottom of the auxiliary frame is used to adapt to the outer surface of the box body;

[0040] Auxiliary welding holes are arranged on the bottom of the slot of the auxiliary frame;

[0041] An auxiliary cover plate is separately fixedly connected to the auxiliary frame to cover the auxiliary frame;

[0042] The flexible corner protection structure comprises a flexible body, wherein the flexible body is an arc-shaped structure;

[0043] The auxiliary frame and the frame body are perpendicular to each other, and the flexible corner protection structure is connected between the auxiliary frame and the frame body.

[0044] The beneficial effects are: the frame body and the auxiliary frame are arranged outside the box body, which improves the strength of the box body. At the same time, the structure of the split weld hidden load-bearing frame is simple and easy to process. The flexible body plays a role of buffering and protecting the box body, which can prevent damage caused by accidental falling of the box body.

[0045] As a further improvement, the flexible corner protection structure further includes a connecting piece, which is integrally formed with the flexible body, and the flexible corner protection structure is connected between the auxiliary frame and the frame body via the connecting piece.

[0046] The beneficial effect is that the connecting piece connects the auxiliary frame and the frame body, connects the auxiliary frame and the frame body into one, increases the strength of the weld-hidden load-bearing frame, and ensures the stability of the flexible corner protection structure.

[0047] As a further improvement, a sealing plate is provided at one end of the auxiliary frame away from the flexible corner protection structure.

[0048] The beneficial effect is that such a design prevents foreign matter from entering the auxiliary frame.

[0049] As a further improvement, the main body cover is detachably fixedly connected to the frame body, and the auxiliary cover is detachably fixedly connected to the auxiliary frame.

[0050] The beneficial effect is that the main cover plate and the auxiliary cover plate are detachable and can be directly replaced after being worn, which is convenient for later maintenance.

[0051] As a further improvement, a clamping structure is provided between the main cover plate and the frame body, and between the auxiliary cover plate and the auxiliary frame.

[0052] The beneficial effects are: the clamping structure is simple in structure, and is convenient for installation and removal between the main cover plate and the frame body, and between the auxiliary cover plate and the auxiliary frame.

[0053] As a further improvement, the snap-fit ​​structure includes a snap-fit ​​groove and a snap-fit ​​protrusion, and the snap-fit ​​groove is an open structure at at least one end in its extension direction, so that the snap-fit ​​protrusion can be pushed into the open end of the snap-fit ​​groove, thereby realizing the snap-fitting of the snap-fit ​​groove and the snap-fit ​​protrusion together.

[0054] The beneficial effect is that when used as a load-bearing frame, the frame body, the main body cover plate, the auxiliary cover plate and the auxiliary frame are generally made of metal, so that the snap-fitting protrusion is pushed in from the open end of the snap-fitting groove, which is conducive to snap-fitting and fixing.

[0055] As a further improvement, an avoidance groove is also provided at the bottom of the groove of the frame body, and the avoidance groove is used to avoid the longitudinal reinforcement on the outer surface of the box body.

[0056] The beneficial effect is that it is suitable for the case where the outer surface of the box body has longitudinal ribs.

[0057] As a further improvement, the main body cover is detachably fixedly connected to the frame body.

[0058] The beneficial effect is that the main body cover is detachable and can be directly replaced after being worn, which is convenient for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a structural schematic diagram of the storage and transportation box of the present invention;

[0060] Figure 2 for Figure 1 Structural diagram of the load-bearing frame with hidden central welds;

[0061] Figure 3 for Figure 2 The main view of the middle frame body and the main body cover after being fixed;

[0062] Figure 4 for Figure 3 Bottom view of

[0063] Figure 5 for Figure 3 Axonometric view of

[0064] Figure 6 for Figure 3 AA section view;

[0065] Figure 7 for Figure 2 Structural schematic diagram of the medium flexible corner protection structure;

[0066] Figure 8 for Figure 7 BB cross-sectional view;

[0067] Fig. 9 This is a schematic diagram of the frame body being welded to the box body;

[0068] Fig.10 for Fig. 9 A schematic diagram of the frame body being connected to the main body cover plate;

[0069] Fig.11 for Fig.10 Schematic diagram of the box after installing the flexible corner protection structure;

[0070] Fig.12 for Fig.11 Schematic diagram of the box after welding the auxiliary frame;

[0071] Fig.13 for Fig.12 Schematic diagram of the auxiliary frame after the auxiliary cover is installed;

[0072] Fig.14 for Fig.13 Schematic diagram after the main cover and auxiliary cover are hidden;

[0073] In the figure: 11, box body; 12, weld hidden load-bearing frame; 13, longitudinal reinforcement; 14, main cover plate; 15, frame body; 16, flexible corner protection structure; 17, auxiliary frame; 18, auxiliary cover plate; 19, sealing plate; 20, main body welding hole; 21, avoidance groove; 22, connecting piece; 23, flexible body; 24, auxiliary welding hole; 25, snap-in protrusion; 26, snap-in groove; 27, weld. DETAILED DESCRIPTION

[0074] 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.

[0075] 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.

[0076] It should be noted that the relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "front", "back", "up", "down", "left" and "right" are based on the orientation and positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0077] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0078] Embodiment 1 of the storage and transportation box of the present invention:

[0079] like Figure 1 As shown, the storage and transportation box includes a box body 11 and a weld-hidden load-bearing frame 12. The weld-hidden load-bearing frame 12 is welded to the outer surface of the box body 11.

[0080] like Figure 2 As shown, the weld hidden type load-bearing frame 12 includes a main cover plate 14 , a frame body 15 , a flexible corner protection structure 16 , an auxiliary frame 17 , an auxiliary cover plate 18 and a sealing plate 19 .

[0081] like Figures 3 to 6 As shown, the frame body 15 is a groove structure, and the groove bottom of the frame body 15 is adapted to the outer surface of the box body 11. The groove bottom of the frame body 15 is provided with two avoidance grooves 21, and the avoidance grooves 21 are trapezoidal, and the avoidance grooves 21 can avoid the longitudinal ribs 13 on the box body 11. In other implementations, if the outer surface of the box body is not provided with longitudinal ribs, the avoidance grooves may not be provided.

[0082] The bottom of the groove of the frame body 15 is also provided with three main body welding holes 20, the main body welding holes 20 are square, and the three main body welding holes 20 and the two avoidance grooves 21 are arranged alternately. Fig. 9 As shown, welding is performed at the edge of the main welding hole 20 to weld and fix the frame body 15 to the box body 11. At this time, a weld 27 is formed at the edge of the main welding hole 20. In other embodiments, the shape of the main welding hole and the avoidance groove is circular, and its shape is not limited to these.

[0083] In this embodiment, the main body cover plate 14 is separately fixed on the frame body 15 to cover the frame body 15. Specifically, Figure 5 and Figure 6 As shown, a snap-in groove 26 is provided on the upper part of the frame body 15 along its extension direction, and a snap-in protrusion 25 is provided on the lower side of the main body cover plate 14 along its extension direction, and the snap-in groove 26 and the snap-in protrusion 25 form a snap-in structure. The snap-in groove 26 is an open structure at both ends of its extension direction, and the snap-in protrusion 25 is pushed into the opening of one end of the snap-in groove 26, so that the main body cover plate 14 and the frame body 15 are snap-in together. In other embodiments, the snap-in groove is an open structure at one end of its extension direction and a closed structure at the other end, and the length of the snap-in protrusion is less than the length of the main body cover plate, and the length of the snap-in protrusion is less than or equal to the length of the snap-in groove, so that the main body cover plate can completely cover the frame body.

[0084] In this embodiment, two flexible corner protection structures 16 are provided. Figure 7 and Figure 8 As shown, the flexible corner protection structure 16 includes a flexible body 23 and a connecting piece 22. The flexible body 23 is a rubber body. The flexible body 23 and the connecting piece 22 are vulcanized into one. The flexible body 23 and the connecting piece 22 are both arc-shaped structures. The connecting piece 22 is made of metal and has threaded holes at both ends. One end of the connecting piece 22 is connected to the frame body 15 by screws, and the other end is connected to the auxiliary frame 17 by screws. Figure 2 As shown, two connecting members 22 are provided.

[0085] like Figure 12 to Figure 14 As shown, the auxiliary frame 17 is a groove-type structure, the bottom of the groove of the auxiliary frame 17 is adapted to the outer surface of the box body 11, and the auxiliary frame 17 is perpendicular to the frame body 15. Two auxiliary welding holes 24 are provided at the bottom of the groove of the auxiliary frame 17, and the auxiliary welding holes 24 are square. Welding is performed at the edges of the auxiliary welding holes 24 to weld and fix the auxiliary frame 17 to the box body 11. At this time, a weld 27 is formed at the edge of the auxiliary welding hole 24. In other embodiments, the auxiliary welding hole 24 is circular, and its shape is not limited to these. Two auxiliary frames 17 are provided, and are respectively located at the two ends of the frame body 15, and the above-mentioned flexible corner protection structure 16 is provided between the frame body 15 and the corresponding auxiliary frame 17.

[0086] like Fig.14 As shown, a sealing plate 19 is provided at one end of the auxiliary frame 17 away from the flexible corner protection structure 16 , and flanges are provided at both ends of the sealing plate 19 , threaded holes are provided on the flanges, and the flanges of the sealing plate 19 are fixed to the auxiliary frame 17 by screws.

[0087] In this embodiment, the auxiliary cover plate 18 is separately fixed on the auxiliary frame 17 to cover the auxiliary frame 17. Specifically, the auxiliary cover plate 18 is clamped on the auxiliary frame 17 in the same way as the frame body and the main body cover plate, which will not be described in detail.

[0088] When welding the weld-seam concealed load-bearing frame 12 on the outer surface of the box body 11, Fig. 9 As shown, the avoidance groove 21 of the frame body 15 is first aligned with the longitudinal ribs 13 on the box body 11, and then the frame body 15 is placed on the upper surface of the box body 11. The frame body 15 is welded at the edge of the main body welding hole 20 to be fixed to the box body 11. At this time, the edge of the main body welding hole 20 forms a weld 27.

[0089] like Fig.10 As shown, the main body cover 14 is inserted from the open end of the frame body 15 , and then the main body cover 14 and the frame body 15 are snap-fitted together, so as to achieve the purpose of hiding the weld 27 with the main body cover 14 .

[0090] like Figure 7 , Figure 8 and Fig.11 As shown, flexible corner protection structures 16 are connected to both ends of the frame body 15 , and one end of the connecting piece 22 is connected to the frame body 15 using screws. The flexible corner protection structure 16 is used to buffer and protect the box body 11 .

[0091] like Fig.12 As shown, the auxiliary frame 17 is first placed at the lower end of the flexible corner protection structure 16, and the bottom of the groove of the auxiliary frame 17 is fitted with the outer surface of the box body 11, and then one end of the connecting piece 22 is connected to the auxiliary frame 17 with screws. At the same time, welding is performed at the edge of the auxiliary welding hole 24 to weld and fix the auxiliary frame 17 to the box body 11, and at this time, a weld 27 is formed at the edge of the auxiliary welding hole 24.

[0092] like Fig.13 As shown, the auxiliary cover plate 18 is pushed in by the lower end of the auxiliary frame 17 , and then the auxiliary cover plate 18 and the auxiliary frame 17 are snap-fitted together, so as to achieve the purpose of hiding the weld 27 with the auxiliary cover plate 18 .

[0093] like Fig.14 As shown, the sealing plate 19 is placed at one end of the auxiliary frame 17 away from the flexible corner protection structure 16, and the flange of the sealing plate 19 is fitted with the inner side of the auxiliary frame 17. The flange of the sealing plate 19 is connected and fixed to the auxiliary frame 17 with screws. The sealing plate 19 can prevent foreign matter from entering the auxiliary frame.

[0094] The weld-hidden load-bearing frame in the storage and transportation box of the present invention has a simple structure and is easy to process. The load-bearing frame is welded to the outer surface of the box body, and the weld is inside the frame. Since the cover plate is fixed to the frame by clamping, the weld is covered by the cover. Therefore, even if the load-bearing frame is outside the box body, the weld will not be exposed, which improves the aesthetics of the storage and transportation box. At the same time, the main cover plate and the auxiliary cover plate can be pulled out and disassembled, and can be directly replaced after wear, which is convenient for later maintenance.

[0095] Embodiment 2 of the storage and transportation box of the present invention:

[0096] The difference between this embodiment and embodiment 1 is that in embodiment 1, the weld hidden load-bearing frame 12 has a frame body 15, an auxiliary frame 17 and a flexible corner protection structure 16, and the flexible corner protection structure 16 connects the frame body 15 and the auxiliary frame 17, so that the weld hidden load-bearing frame 12 is a U-shaped structure as a whole. In this embodiment, the weld hidden load-bearing frame only includes a frame body, and the frame body is a U-shaped structure as a whole.

[0097] Embodiment 3 of the storage and transportation box of the present invention:

[0098] The difference between this embodiment and embodiment 1 is that in embodiment 1, the flexible corner protection structure 16 includes a connector 22 and a flexible body 23, the connector 22 and the flexible body 23 are vulcanized into one, and the flexible corner protection structure 16 is connected to the auxiliary frame 17 and the frame body 15 through the connector 22. In this embodiment, the flexible corner protection structure only includes the flexible body, and the ends of the flexible body are respectively clamped with the auxiliary frame and the frame body.

[0099] Embodiment 4 of the storage and transportation box of the present invention:

[0100] The difference between this embodiment and embodiment 1 is that in embodiment 1, the main body cover plate 14 is fixed to the frame body 15 by a snap-fit ​​structure, so that the main body cover plate is fixedly connected to the frame body in a split manner, and the main body cover plate 14 is detachable and replaceable. In this embodiment, the main body cover plate is welded and fixed to the frame body, so that the main body cover plate is fixedly connected to the frame body in a split manner.

[0101] Embodiment 5 of the storage and transportation box of the present invention:

[0102] The difference between this embodiment and embodiment 1 is that in embodiment 1, the main body cover plate 14 and the frame body 15 as well as the auxiliary cover plate 18 and the auxiliary frame 17 are all fixed by a clamping structure. In this embodiment, the main body cover plate and the frame body as well as the auxiliary cover plate and the auxiliary frame are all fixed by screws.

[0103] An embodiment of the weld-hidden load-bearing frame of the present invention: The structure of the weld-hidden load-bearing frame is the same as that of any one of the weld-hidden load-bearing frames of Embodiments 1 to 5 of the above-mentioned storage and transportation box, and will not be described in detail here.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. The weld-hidden load-bearing frame is characterized by: include: The frame body is a groove-type structure, and the groove bottom of the frame body is used to adapt to the outer surface of the box body. The groove bottom of the frame body is also provided with an avoidance groove, and the avoidance groove is used to avoid the longitudinal reinforcement on the outer surface of the box body; The main body welding hole is arranged on the groove bottom of the frame body; The main body cover plate is separately fixedly connected to the frame body to cover the frame body; The auxiliary frame is a groove-shaped structure, and the groove bottom of the auxiliary frame is used to adapt to the outer surface of the box body; Auxiliary welding holes are arranged on the bottom of the slot of the auxiliary frame; An auxiliary cover plate is separately fixedly connected to the auxiliary frame to cover the auxiliary frame; The flexible corner protection structure comprises a flexible body, wherein the flexible body is an arc-shaped structure; The auxiliary frame is perpendicular to the frame body, and the flexible corner protection structure is connected between the auxiliary frame and the frame body. A clamping structure is provided between the main cover plate and the frame body and between the auxiliary cover plate and the auxiliary frame. The clamping structure includes a clamping groove and a clamping protrusion. The clamping groove is an open structure at at least one end in its extension direction, so that the clamping protrusion is pushed in from the open end of the clamping groove, thereby realizing the clamping groove and the clamping protrusion being clamped together.

2. The weld-hidden load-bearing frame according to claim 1, characterized in that: The flexible corner protection structure also includes a connecting piece, which is integrally formed with the flexible body, and the flexible corner protection structure is connected between the auxiliary frame and the frame body through the connecting piece.

3. The weld-hidden load-bearing frame according to claim 1 or 2, characterized in that: A sealing plate is provided at one end of the auxiliary frame away from the flexible corner protection structure.

4. The weld-hidden load-bearing frame according to claim 1 or 2, characterized in that: The main body cover is detachably fixedly connected to the frame body, and the auxiliary cover is detachably fixedly connected to the auxiliary frame.

5. The weld-hidden load-bearing frame according to claim 1, characterized in that: The main body cover is detachably fixedly connected to the frame body.

6. A storage and transportation box, comprising a box body, characterized in that: A weld-hidden load-bearing frame is welded on the outer surface of the box body, and the weld-hidden load-bearing frame is the weld-hidden load-bearing frame described in any one of claims 1 to 5.

Images