Foldable box

Abstract

The application discloses a foldable box. The foldable box has a box body and a box cover. The box body has a base and a pair of opposite first side plates and a pair of opposite second side plates foldably connected to the base. An edge of the box cover is hinged to a top end of the box body. Sealing members are arranged at the connection between the box cover and the first side plates and the second side plates, the connection between the base and the first side plates and the second side plates, and the connection between the first side plates and the second side plates. The foldable box can be folded and sealed well.

Description

TECHNICAL FIELD

[0001] The present application relates to a container, in particular to a foldable box. BACKGROUND

[0002] The existing foldable container, when in use, the side plates are unfolded and erected, the four side plates are interlocked, thereby forming a relatively closed space to accommodate goods. When the foldable container is used to load food such as vegetables, fruits and fresh food, especially when cold chain transportation is required, the relative closure of the container is particularly important, because fresh food transportation is easily contaminated by the external environment, resulting in food corrosion and deterioration. Most of the existing containers are foldable containers without lids, and fresh food is loaded into the container, and the top of the container is generally open, so that the food is easily affected by the external conditions. The existing containers with lids cannot be folded, and storage and transportation are extremely inconvenient.

[0003] Therefore, there is a need in the art for a foldable container with a lid that can ensure relative closure in an unfolded and erected state and can be conveniently folded and stored when idle. SUMMARY

[0004] The purpose of the present application is to provide a foldable container with a single flip cover, which is folded and stored in the bottom edge of the cover when idle, and preferably can ensure the relative closure of the container in an unfolded and erected state.

[0005] To achieve the above-mentioned purpose, the present application provides a foldable box, the foldable box has a box body and a box cover, wherein the box body has a base and a pair of opposite first side plates and a pair of opposite second side plates foldably connected to the base, and an edge of the box cover is hinged to a top end of the box body, wherein the connection between the box cover and the first side plate and the second side plate, the connection between the base and the first side plate and the second side plate, and the connection between the first side plate and the second side plate are all provided with sealing elements.

[0006] In an embodiment, the sealing element between the box cover and the first side plate and the second side plate is arranged on the bottom side of the box cover and fixedly connected to the box cover.

[0007] In an embodiment, the box cover is formed by welding an inner plate and an outer plate to each other, the outer plate at a pair of opposite edges of the box cover extends beyond the edges of the inner plate, one of the other pair of opposite edges is provided with a box cover hinge part, and the other edge of the outer plate and the inner plate is flush or also extends beyond the edges of the inner plate, and the sealing element on the box cover is connected to the inner plate.

[0008] In one embodiment, the outer panel of the lid at the other edge opposite the edge provided with the lid hinge is provided with a catch edge, and the inner top end of the first side panel is provided with an upwardly open groove into which the catch edge is operatively catchable.

[0009] In one embodiment, the lid is further configured such that, in the closed lid condition, the portion of the outer panel of the lid extending beyond the edge of the inner panel overlaps the second side panel.

[0010] In one embodiment, the seal of the lid is a ring-shaped member having two pairs of opposite sides, one pair of opposite sides of the seal of the lid extending beyond the outer edge of the inner panel of the second side panel, and one of the other pair of opposite sides being operatively abuttable against the first side panel.

[0011] In one embodiment, the lid is hinged to one of the pair of opposite first side panels, and the inner side of the top end of the other of the pair of opposite first side panels is provided with an upwardly and inwardly open groove into which a portion of the seal of the lid is operatively abuttable.

[0012] In one embodiment, the seal of the lid has a seal body and at least one row of mounting posts protruding from the seal body, the distal end of the mounting posts being provided with a catch, and the lid having corresponding mounting holes into which the catches are catchable.

[0013] In one embodiment, the first edge of the lid is hinged to the top end of one of the pair of first side panels by a hinge member, the first edge of the lid being provided with a lid hinge, and the top end of one of the pair of first side panels being provided with a side panel hinge, wherein the first and second edges of the hinge member are provided with a first and second body hinge, respectively, the lid hinge and the first body hinge being hingedly connected to each other, and the side panel hinge and the second body hinge being hingedly connected to each other, wherein the underside of the hinge member is connected with a hinge member seal, the first side edge of the hinge member seal being operatively abuttable against the first side panel.

[0014] In one embodiment, the second side edge of the hinge member seal opposite the first side edge overlaps the seal on the lid.

[0015] In one embodiment, the plate-shaped body of the second side panel is provided with a side panel engaging portion on each of the left and right side edges, the side panel engaging portion being connected with a side panel seal, the side panel seal extending beyond the side panel engaging portion.

[0016] In one embodiment, the side plate seal has an elongated plate body with a plurality of protrusions spaced apart from each other, and the side plate engaging portion has corresponding grooves, and the protrusions on the elongated plate body are operatively fixed in the grooves.

[0017] In one embodiment, the first side plate and the second side plate each have a plate body and a plurality of hinge extensions spaced apart from each other and extending downward from the lower portion of the plate body, and the base has a plate body and two pairs of opposite side guards extending upward from two pairs of opposite edges of the plate body, and the side guards have cavities open upward and toward the inside of the box, and the cavities of the base are provided with seals, and / or the hinge extensions are provided with seals.

[0018] In one embodiment, the seals installed on the hinge extensions are located on the left and right sides and the lower side of the hinge extensions and extend beyond the left and right sides and the lower side of the hinge extensions.

[0019] In one embodiment, the left and right side edges of the plate body of the second side plate are provided with seals.

[0020] In one embodiment, each of the hinge extensions is connected with a separate seal.

[0021] In one embodiment, the base has a plate body and a pair of opposite side guards extending upward from a pair of opposite edges of the plate body, and the side guards have cavities open upward and toward the inside of the box, and the cavities have base limiting portions extending upward from the bottom walls of the cavities, and the first side plate and the second side plate each have a plate body and a plurality of hinge extensions spaced apart from each other and extending downward from the lower portion of the plate body, and the left and right side edges of the plate body of the first side plate and / or the second side plate are provided with seals, and the bottom end of each hinge extension is provided with a side plate hinge shaft, and the side plate hinge shaft cooperates with the base limiting portion, and the seals installed on the hinge extensions are located on the left and right sides and the lower side of the hinge extensions and extend beyond the left and right sides and the lower side of the hinge extensions.

[0022] In one embodiment, the left and right edges of the seals installed on the hinge extensions are provided with vertical grooves, and / or the lower edge is provided with a horizontal groove.

[0023] In one embodiment, the side guards are further provided with base guide portions located in the base limiting portions and open toward the inside, and each of the hinge extensions is further provided with side plate guide portions located between the side plate hinge shafts, and the side plate guide portions are slidably connected to the base guide portions.

[0024] In an embodiment, the base limiting portion is a plate-shaped portion, the base guiding portion is a groove provided at a middle portion of the base limiting portion, and first base limiting protrusions are provided at upper portions of both side walls of the groove.

[0025] In an embodiment, the hinge extending portion has a plate-shaped body, the side plate hinge shafts extend from both left and right sides of a bottom end of the plate-shaped body in a direction parallel to the side plate, and the side plate guiding portion is a guiding block extending from the plate-shaped body in a direction perpendicular to the plate-shaped body.

[0026] In an embodiment, each of the first side plate, the second side plate, and the box cover is formed by welding an inner plate and an outer plate to each other, a thermal insulation layer is provided between the inner plate and the outer plate, and the base has a plate-shaped body and a protective edge extending upward from a periphery of the plate-shaped body, a thermal insulation layer is provided in the plate-shaped body and the protective edge.

[0027] In an embodiment, a first edge of the box cover is hingedly connected to a top end of one of a pair of the first side plates by a hinge member, the box cover is provided with a box cover hinge portion along the first edge, and the top end of one of the pair of the first side plates is provided with a side plate hinge portion, wherein the first edge and the second edge of the hinge member are respectively provided with a first main body hinge portion and a second main body hinge portion, the box cover hinge portion and the first main body hinge portion are hingedly connected to each other, and the side plate hinge portion and the second main body hinge portion are hingedly connected to each other.

[0028] In an embodiment, the hinge member is a separate component from the box body and the box cover, and the box cover hinge portion is provided only along the first edge of the box cover.

[0029] In an embodiment, the hinge member and the box cover are hingedly connected to form an assembly having a size matching a size of an opening of the foldable box.

[0030] In an embodiment, the first main body hinge portion of the hinge member is provided with a plurality of grooves spaced apart from each other along the first edge, and at least a portion of the box cover hinge portion of the box cover is located in the grooves.

[0031] In an embodiment, the hinge member and the box cover are provided with a width such that, when the box cover is folded onto an outer side of the side plate, an edge of the box cover does not extend beyond a bottom end of the side plate.

[0032] In an embodiment, the box cover has a plate-shaped body, and edges of the box cover other than the first edge are respectively operatively lapped over top ends of the first side plate and the second side plate.

[0033] In one embodiment, the lid hinge portion comprises a plurality of lid extensions spaced apart from each other, each of the lid extensions is provided with a hinge hole; the side plate hinge portion comprises a plurality of side plate extensions spaced apart from each other, each of the side plate extensions is provided with a hinge hole; the first body hinge portion and the second body hinge portion respectively comprise a plurality of first body extensions spaced apart from each other and a plurality of second body extensions spaced apart from each other, each of the first body extensions and each of the second body extensions is provided with a hinge hole; wherein a first hinge shaft passes through the hinge holes of the lid extensions and the hinge holes of the first body extensions, and a second hinge shaft passes through the hinge holes of the second body extensions and the hinge holes of the side plate extensions.

[0034] In one embodiment, the lid hinge portion comprises a plurality of lid extensions spaced apart from each other, the side plate hinge portion comprises a plurality of side plate extensions spaced apart from each other, and the first body hinge portion and the second body hinge portion respectively comprise a plurality of first body extensions spaced apart from each other and a plurality of second body extensions spaced apart from each other; wherein one of the lid extensions and one of the first body extensions are provided with a hinge shaft, and the other is provided with a hinge hole matched with the hinge shaft; one of the side plate extensions and one of the second body extensions are provided with a hinge shaft, and the other is provided with a hinge hole matched with the hinge shaft.

[0035] In one embodiment, one pair of the two pairs of opposite side plates is a long side plate with a longer length, and the other pair of side plates is a short side plate with a shorter length, and the lid is hinged to the top end of one of the long side plates.

[0036] In one embodiment, the base has a plate-shaped body and a pair of opposite side edges extending upwardly from the plate-shaped body, the side edges are provided with a cavity with an upward and inward opening, the upper part of the two side walls of the cavity is provided with a first base limiting protrusion, the middle part of the cavity is provided with a base limiting portion extending upwardly from the bottom wall of the cavity and a base guide portion opening inwardly in the base limiting portion; the bottom end of the long side plate is provided with a plurality of hinge extensions spaced apart from each other, the bottom end of each of the hinge extensions is provided with a side plate hinge shaft and a side plate guide portion between the side plate hinge shafts; wherein the side plate hinge shafts are matched with the first limiting protrusions and the base limiting portion, and the side plate guide portion is matched with the base guide portion.

[0037] In one embodiment, the lid is further provided with a locking mechanism for locking the lid to the side plate, the locking mechanism is arranged in the other half part than the half part provided with the lid hinge portion.

[0038] In one embodiment, each of the first side plate, the second side plate and the cover is formed by welding an inner plate and an outer plate together, and a thermal insulation layer is provided between the inner plate and the outer plate; and the base has a plate-shaped body and a flange extending upward from the periphery of the plate-shaped body, and a thermal insulation layer is provided in the plate-shaped body and the flange.

[0039] In one embodiment, the inner periphery of one of the inner plate and the outer plate is provided with two rows of welding ribs spaced apart from each other.

[0040] In one embodiment, the outer plate at one pair of opposite edges of the cover extends beyond the edge of the inner plate, one edge of the other pair of opposite edges is provided with a cover hinge, and the outer plate and the inner plate at the other edge are flush.

[0041] In one embodiment, the cover is hinged to one of the pair of opposite first side plates, and the inner side of the top end of the other of the pair of opposite first side plates is provided with a groove opening upward and toward the inside of the box.

[0042] In one embodiment, the top of the first side plate and the second side plate is provided with a closed cavity.

[0043] In one embodiment, the left and right ends of the first side plate and the second side plate are each provided with a side plate engaging portion, and the bottom end of the first side plate and the second side plate is provided with a hinge extension portion, wherein the side plate engaging portion and the hinge extension portion are integrally formed on the side plate.

[0044] In one embodiment, the side plate engaging portion and the hinge extension portion are integrally formed on the side plate.

[0045] In one embodiment, the base is formed by welding a base body and a bottom plate together.

[0046] In one embodiment, the base body is provided with a plate-shaped body cavity and two pairs of opposite flange cavities, wherein the plate-shaped body cavity and the flange cavities are spaced apart from each other.

[0047] In one embodiment, the flange is provided with a plurality of recesses spaced apart from each other and opening upward and toward the inside of the box, and a thermal insulation layer is provided in the inside of the flange between the recesses.

[0048] In one embodiment, the first edge of the lid is hinged to the top end of one of the pair of first side panels by a hinge, the first edge of the lid is provided with a lid hinge portion, and the top end of one of the pair of first side panels is provided with a side panel hinge portion, wherein the first edge and the second edge of the hinge are provided with a first body hinge portion and a second body hinge portion respectively, the lid hinge portion and the first body hinge portion are hinged to each other, and the side panel hinge portion and the second body hinge portion are hinged to each other, wherein the underside of the hinge body is connected with a hinge seal, and the first side edge of the hinge seal is operatively abutting against the first side panel.

[0049] In one embodiment, at least a portion of the second side edge of the hinge seal opposite to the first side edge overlaps with a seal on the lid.

[0050] In one embodiment, the second side panel has a plate-shaped body and a plurality of hinge extensions extending from the lower portion of the plate-shaped body, the bottom end of each hinge extension is provided with a side panel hinge portion, and the left and right side edges of the plate-shaped body and the side panel hinge portions are each provided with a seal.

[0051] In one embodiment, each side panel hinge portion is provided with a separate seal.

[0052] In one embodiment, the left and right side edges of the plate-shaped body of the second side panel are each provided with a side panel engaging portion, the side panel engaging portion is connected with a side panel seal, and the side panel seal extends beyond the side panel engaging portion.

[0053] In one embodiment, the thermal insulation layer is made of polyurethane foam, polystyrene board or phenolic foam.

[0054] The foldable box of the present application can achieve good sealing while being foldable. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 is a perspective view of a foldable box according to the present application.

[0056] Figure 2 is an exploded perspective view of a side panel, a hinge and a lid of a foldable box according to the present application.

[0057] Figure 3 is a perspective view of a foldable box according to the present application in a folded state.

[0058] Figure 3A is Figure 3 is an enlarged view of detail A in

[0059] Figure 3B is Figure 3 is an enlarged view of detail B in

[0060] Figure 4 is a perspective view of a pair of side panels removed from a collapsible box according to the present application.

[0061] Figure 4A is Figure 4 is an enlarged view of detail A in

[0062] Figure 4B is Figure 4 is an enlarged view of detail B in

[0063] Figure 5 is a perspective view of the outward folding of the lid relative to the side panels of a collapsible box according to the present application.

[0064] Figure 5A is Figure 5 is an enlarged view of detail A in

[0065] Figure 6A is a perspective view of the folding of a pair of opposing side panels relative to the base of a collapsible box according to the present application.

[0066] Figure 6B is a perspective view of a side panel of a collapsible box according to the present application.

[0067] Figure 6C is a schematic view of the detachment of a side panel from the base of a collapsible box according to the present application.

[0068] Figure 6D is Figure 6C is an enlarged view of detail D in

[0069] Figure 7 is a partially exploded perspective view of a collapsible box according to the present application with a pair of opposing side panels folded over the base.

[0070] Figure 8 is a partial cross-sectional view of the side panels in an upright position relative to the base with the hinge portions sectioned open.

[0071] Figure 8A is Figure 8 is an enlarged view of detail A in

[0072] Figure 9 is a longitudinal cross-sectional perspective view of a collapsible box provided with a thermal insulation layer.

[0073] Figure 9A and 9B are respectively Figure 9 are enlarged views of details A and B in

[0074] Figure 10 is a partially exploded perspective view of the base of a collapsible box according to the present application.

[0075] Figure 10A is Figure 10 is an enlarged view of detail A in

[0076] Figure 11 is a partial cutaway exploded perspective view of a side panel of a collapsible box according to the present invention.

[0077] Figure 11A is an enlarged view of detail A of Figure 11

[0078] Figure 12 is a partial cutaway exploded perspective view of a lid of a collapsible box according to the present invention.

[0079] Figure 12A is an enlarged view of detail A of Figure 12

[0080] Figure 13 is a partial cutaway perspective view of a collapsible box according to the present invention, with both side panels cut away where they meet the lid.

[0081] Figure 13A is an enlarged view of detail A of Figure 13

[0082] Figure 14 is another partial cutaway perspective view of a collapsible box according to the present invention, with both side panels cut away where they meet the base.

[0083] Figure 14A is an enlarged view of detail A of Figure 14

[0084] Figure 15 is yet another partial cutaway perspective view of a collapsible box according to the present invention, with the side panels cut away at their bottom ends.

[0085] Figure 15A is an enlarged view of detail A of Figure 15

[0086] Figure 16 is a partial cutaway view of a side panel of a collapsible box according to the present invention, with the hinge extension cut away.

[0087] Figure 16A is an enlarged view of detail A of Figure 16

[0088] Figure 17 is a perspective view of a side panel of a collapsible box according to the present invention, and its seal.

[0089] Figure 18 is a perspective view of another side panel of a collapsible box according to the present invention, and its seal.

[0090] Figure 19 is a perspective view of a lid of a collapsible box according to the present invention, and its seal. ​​​​​​

[0091] Figure 20 is a partial cutaway perspective view of a foldable box according to the present application.

[0092] Figure 20A is an enlarged view of detail A of Figure 20

[0093] Figure 20B is an enlarged view of detail B of Figure 20

[0094] Figure 21 is a perspective view of a hinge and its seal.

[0095] Figure 22 is a perspective view of a hinge assembled with its seal.

[0096] Figure 22A is an enlarged view of detail A of Figure 22 DETAILED DESCRIPTION

[0097] The preferred embodiments of the present application will be described herein below with reference to the accompanying drawings, in which the purpose, features and advantages of the present application will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present application, but are merely intended to illustrate the essential spirit of the technical solutions of the present application.

[0098] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. It will be appreciated, however, that embodiments can be practiced in many different inventive ways without resorting to the details that are presented. In other instances, well-known devices, structures and techniques have not been shown or described in detail in order to avoid unnecessarily obscuring this description.

[0099] Unless otherwise needed by the context, the words "comprise" and variations such as "comprising", and "having" throughout the specification and claims, are to be construed in an open, inclusive and non-exclusive sense, that is, as "including, but not limited to".

[0100] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0101] ​​​As used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or", unless the context clearly dictates otherwise.

[0102] In the following description, for purposes of clarity, directional terms are used to describe the structure and working of the present application. However, it should be noted that the terms "front", "back", "left", "right", "outer", "inner", "outward", "inward", "upper", "lower", and the like are used only to facilitate the description of the application and are not intended to limit the scope of the application.

[0103] Embodiments of the present application will be described hereinafter with reference to the drawings. In particular, reference is made to Figure 1 Fig. 1 shows a collapsible container 100 according to the present application, comprising a base 1, two pairs of side panels 2, 3 and a lid 4. Each pair of side panels 2, 3 is hingedly connected to the edges of the base 1 at the bottom end and foldable relative to the base 1, and the lid 4 is hingedly connected to the top end of one of the side panels 2 of one pair of side panels 2 by a hinge 5. The longitudinal ends of the side panels 2, 3 are each provided with a snap portion 202 and 302, and the side panels 2 and 3 are connected to each other by the snap portions 202 and 302 when the side panels are upright relative to the base 1, thereby forming an inner volume of the collapsible container 100 together with the base 1, and the lid 4 can cover the top opening of the collapsible container 100. When the side panels 2, 3 and the lid 4 are folded relative to the base 1, the collapsible container 100 can be conveniently stored and transported. It should be understood that the connection between the side panels 2 and 3 is not limited to the above-mentioned snap connection, but can be any connection that allows the side panels to be connected to each other in a head-to-tail manner to enclose an inner space. The bottom end of the side panels 2 and 3 is provided with a side panel hinge portion to be hingedly connected to the outer edge of the base 1.

[0104] Figure 2 Fig. 2 shows an exploded perspective view of one side panel 2, the hinge 5 and the lid 4 of the collapsible container 100. As shown in the figure, the lid 4 is provided with a lid hinge portion 411 along a first edge 41 adjacent to the side panel 2, and the top end 21 of the side panel 2 (also referred to as a long side panel or a first side panel) is provided with a side panel hinge portion 211. The hinge 5 has a first edge 51 adjacent to the lid 4 and a second edge 52 adjacent to the side panel 2, and the first edge 51 and the second edge 52 of the hinge 5 are respectively provided with a first main hinge portion 511 and a second main hinge portion 521. The lid hinge portion 411 and the first main hinge portion 511 are hingedly connected to each other, and the side panel hinge portion 211 and the second main hinge portion 521 are hingedly connected to each other.

[0105] In addition, in order to better allow the lid 4 to close on the top end opening, preferably a recess is provided on the inside of the top end of the other of the pair of opposite side panels 2, which is upwardly open and faces the inside of the box, thereby serving to receive the second edge 42 of the lid 4 in the use state.

[0106] In the illustrated embodiment, the pair of side plates 2 are long side plates of a pair of opposing side plates, and the other pair of side plates 3 (also referred to as short side plates or second side plates) are short side plates. The lid 4 is hinged to the top end 21 of one of the long side plates 2. It should be understood, however, that the lid 4 can be hinged to the top end of one of the short side plates 3 by the hinge member without departing from the scope of the present application.

[0107] In Figure 2 In the illustrated embodiment, the lid hinge portion 411 includes a plurality of lid extensions 4111 spaced apart from each other, each of the lid extensions 4111 extending horizontally from the edge 41 of the lid 4 in the plane of the lid 4, and each of the lid extensions 4111 is provided with a hinge hole 4112 extending substantially in the direction of the first edge 41. The side plate hinge portion 211 includes a plurality of side plate extensions 2111 spaced apart from each other, each of the side plate extensions 2111 extending upwardly from the top end 21 of the side plate 2 in the plane of the side plate 2, and each of the side plate extensions 2111 is provided with a hinge hole 2112 extending substantially in the direction of the top end 21 of the side plate 2. The first body hinge portion 511 and the second body hinge portion 512 each include a plurality of first body extensions 5111 and second body extensions 5121 spaced apart from each other, each of the first body extensions 5111 is provided with a hinge hole 5112, and each of the second body extensions 5121 is provided with a hinge hole 5122. The hinge holes 5112 and 5122 extend substantially in the direction of the edges 51 and 52 of the hinge body 5, respectively. Preferably, the hinge holes 4112 are aligned with each other, and the hinge holes 5112 are also aligned with each other, so that when the lid extensions 4111 and the first body extensions 5111 are interleaved with each other, the hinge holes 4112 and the hinge holes 5112 are aligned with each other, thereby enabling the hinge 5 to be hinged to the lid 4 by passing the first hinge shaft 53 through the hinge holes 4112 and 5112. Preferably, the hinge holes 2112 are aligned with each other, and the hinge holes 5122 are also aligned with each other, so that when the side plate extensions 2111 and the second body extensions 5121 are interleaved with each other, the hinge holes 2112 and the hinge holes 5122 are also aligned with each other, thereby enabling the hinge 5 to be hinged to the side plate 2 by passing the second hinge shaft 54 through the hinge holes 2112 and 5122. More preferably, the first edge 51 and the second edge 52 of the hinge body 5 are parallel to each other. In this way, after the lid 4 is hinged to the side plate 2 via the hinge 5, the first hinge shaft 53 and the second hinge shaft 54 are parallel to each other.

[0108] Preferably, the first body hinge portion 511 of the hinge member 5 is provided with a plurality of grooves 512 spaced apart from each other along the first edge 51, and at least a portion of the lid hinge portion 411 of the lid 4, specifically each lid extension portion 4111 of the lid hinge portion 411, is located in a groove 512. Preferably, when the lid 4 closes the opening of the foldable container 100, each lid extension portion 4111 is snugly located in each groove 512, thereby further ensuring the closure of the opening.

[0109] In addition, in an embodiment not shown, one of the lid extension portion 4111 and the first body extension portion 5111 can be provided with a hinge shaft, and the other can be provided with a hinge hole for cooperating with the hinge shaft, so that the hinge of the lid 4 and the hinge member 5 is achieved by fitting the hinge shaft into the hinge hole. Alternatively or additionally, one of the side panel extension portion 2111 and the second body extension portion 5121 can be provided with a hinge shaft, and the other can be provided with a hinge hole for cooperating with the hinge shaft, so that the hinge of the side panel 2 and the hinge member 5 is achieved by fitting the hinge shaft into the hinge hole.

[0110] Of course, it should be understood that the hinge between the lid 4 and the hinge member 5 and the hinge between the side panel 2 and the hinge member 5 are not limited to the above-mentioned manner, and other conventional hinge manners in the art can also be adopted without departing from the scope of the present application, for example, being hingedly connected to each other through a flexible thinning portion. In the present application, when the lid 4 is hingedly connected to the side panel 2 through the hinge member 5, the lid 4 can be rotated more than 270° around the top end of the side panel 2 relative to the side panel 2, as shown in Figure 5 When the foldable container 100 is in a use state, the lid 4 is perpendicular to the side panel 2 and closes the opening of the foldable container 100. When the foldable container 100 is in a storage state, the lid 4 can be rotated relative to the top end of the side panel 2 to be placed on the outer surface of the side panel 2, so that after the other three side panels are folded and placed on the base 1, the side panel 2 and the lid 4 can be folded and placed on the other three side panels. In this way, the foldable container 100 in the storage state is convenient for storage and transportation.

[0111] In the embodiment shown in the drawings, the hinge member 5 is a separate component from the side panel 2 and the lid 4, and the lid hinge portion 411 is only provided along the first edge 41 of the lid 4. However, it should be understood that the hinge member 5 can also be integrally formed with one or both of the side panel 2 and the lid 4 without departing from the scope of the present application. For example, as mentioned above, the hinge member 5 can be hingedly connected to the top end 21 of the side panel 2 and / or the first edge 41 of the lid 4 through a flexible thinning portion. Preferably, the thickness of the hinge member 5 is equal to the sum of the thicknesses of the side panel 2 and the lid 4, so that when the lid 4 is folded onto the outer surface of the side panel 2, it can be snugly fitted with the outer surface of the side panel 2 without protruding upward.

[0112] When the collapsible container 100 is in use, the assembly of the hinge 5 and the lid 4 hingedly connected to each other has a size matching the size of the opening of the collapsible container 100, so as to close the opening of the collapsible container 100. When the collapsible container 100 is in storage, as shown in Figure 3 the side panel 2 is folded onto the base 1, and the lid 4 is rotated and folded outside the side panel 2. At this time, the second edge 42 opposite to the first edge 41 of the lid 4 does not extend beyond the bottom end of the side panel 2, so as to ensure that the second edge 42 of the lid 4 does not extend beyond the outer edge of the base 1 in the folded state.

[0113] Figure 2 The lid 4 shown in Figure 4 has a plate-shaped body, and the other three edges of the lid 4 except the first edge 41 are respectively operatively lapped on the top end of the other side panel 2 and the two side panels 3, as shown in

[0114] In the collapsible container 100 shown in Figure 1 , the base 1 has a plate-shaped body 11 and a pair of opposite guards 12 extending upward from a pair of opposite edges of the plate-shaped body 11. Figure 6A The collapsible container 100 with the side panel 2 in the folded state is shown. Figure 6C The perspective view of the side panel 2 separated from the base 1 is shown. Among them Figure 6D the partial enlarged view thereof is shown. As Figure 6DAs shown, the edge guard 12 is provided with a concave cavity 121 which opens upward and inward, the upper part of the two side walls of the concave cavity 121 is provided with a first base limiting protrusion 1211, the middle part of the concave cavity 121 is provided with a base limiting part 1212 which extends upward from the bottom wall of the concave cavity 121 and a base guiding part 1213 which is located in the base limiting part and opens inward. The base limiting part 1212 is in the shape of "T" in cross section, thereby forming two long strip-shaped open grooves 1214 with the side walls of the concave cavity 121. The base guiding part 1213 is a longitudinal extending concave cavity. The base guiding part 1213 extends upward (longitudinally) from a position which is at a predetermined distance from the base limiting part by a predetermined distance. The bottom end of the side plate 2 is provided with a plurality of downward extending hinge extending parts 22 which are spaced apart from each other. When the side plate 2 is upright relative to the base 1, the hinge extending parts 22 are accommodated in the concave cavity 121. The hinge extending part 22 comprises two side plate limiting parts 221 which extend downward from the side plate 2, the opposite sides of the two side plate limiting parts 221 are provided with side plate hinge shafts 223 which can rotate and slide up and down in the grooves 1214, so as to switch the side plate 2 between the upright state and the folded state relative to the base 1. A side plate guiding part 222 is further provided between the two side plate limiting parts 221. The side plate guiding part 222 has a plate-shaped part 222a which is connected between the two side plate limiting parts 221 and a guiding block 222b which extends perpendicularly from the plate-shaped part 222a. The guiding part is slidably connected to the base guiding part. When the side plate 2 is in the upright state, the guiding block 222b is engaged in the base guiding part 1213, thereby fixing the side plate 2 to the edge guard 12, as shown in Figure 8 partial sectional view and partial enlarged view Figure 8A As shown. The structure of the base guiding part 1213 and the structure of the side plate guiding part 222 make the connection between the side plate and the base flat without any concave when the side plate is in the folded state. When the side plate 2 is in the folded state, the first base limiting protrusion 1211 blocks the side plate limiting part 221, so as to prevent the side plate 2 from separating upward from the base 1. Four concave cavities 121 provided on the edge guard 12 and four hinge extending parts 22 provided at the bottom end of the side plate 2 are shown in the figure, but it should be understood that any suitable number of concave cavities 121 and hinge extending parts 22 can be provided as needed.

[0115] Preferably, the box cover 4 is further provided with a locking mechanism for locking the box cover 4 to the side plate, the locking mechanism is provided at the part of the box cover 4 which is away from the first edge 41, so as to more stably close the box cover 4 to the side plate.

[0116] The foldable box 100 of the present application can also have a heat preservation function by providing a heat preservation layer in the base 1, the side plates 2 and 3 and the box cover 4. As shown in Figure 9 and 9AAs shown in Figure 9B, each of the first side panel 2, the second side panel 3, and the box cover 4 is composed of an inner panel and an outer panel welded together, with an insulation layer between the inner and outer panels. Figure 10 and 10A As shown, the plate-shaped main body 11 and the edge guard 2 of the base 1 are also provided with an insulation layer 16. The aforementioned insulation layers can be pre-fabricated insulation boards placed in the base, side panels, and lid, or they can be filled with insulation material after the base, side panels, and lid are manufactured. The insulation material can be polyurethane foam, polystyrene board, phenolic foam, etc.

[0117] exist Figure 9A The enlarged detail view shows the internal structure at the top 21 of the side panel 2 and the internal structure at the first edge 41 of the lid 4. The side panel 2 is formed by welding an outer side panel 23 and an inner side panel 24 together, and the lid 4 is formed by welding an outer lid panel 43 and an inner lid panel 44 together. A weld rib 25 is provided on the inner periphery of the inner panel 24 of the side panel 2. The weld rib 25 extends generally along the outer periphery of the inner panel 24 and from the outer surface of the inner side panel 24 toward the inner surface of the outer side panel 23, and is used to weld to the inner surface of the outer side panel 23 at its end. However, it should be understood that the weld rib 25 may also be provided on the inner periphery of the outer side panel 23 and extend from the inner surface of the outer side panel 23 toward the outer surface of the inner side panel 24, and is used to weld to the outer surface of the inner side panel 24 at its end. It should also be understood that weld ribs 25 may be provided on both the inner periphery of the outer side panel 23 and the inner periphery of the inner side panel 24, with the ends of the weld ribs 25 welded together. Preferably, as shown in the figure, the side panel 2 is provided with two parallel and spaced-apart weld ribs 25. When the side panel 2 and lid 4 of the foldable case 100 are made of plastic, the welding of the weld ribs 25 to the outer surface of the inner panel 24, the inner surface of the outer panel 23, or to another weld rib 25 is achieved by ultrasonic welding to better ensure the seal of the weld. An insulation layer 26 is provided within the internal space enclosed by the inner panel 23, the outer panel 24, and the weld ribs 25. The arrangement of the two spaced-apart weld ribs 25 further ensures the airtightness of the space enclosed by the outer panel, the inner panel, and the weld ribs relative to the outside. Furthermore, for ease of manufacturing, preferably, the aforementioned side panel interlocking portion and side panel hinge portion are integrally formed on the outer panel 23.

[0118] Side panel 3 can also be welded together from outer panel 30 and inner panel 31, with insulation layer 36 filling the gap. Its specific structure is the same as that of side panel 2, and will not be described in detail here.

[0119] With two weld bars 25 provided, the top of the side plate 2 is provided with a sealed cavity, which is formed by the two weld bars 25, the inner plate 24 and the outer plate 23.

[0120] For example Figure 9AAs shown, the outer periphery of the outer panel 43 of the lid 4 is provided with a welding rib 45 which extends substantially along the direction of the outer periphery of the outer panel 43 and extends from the inner surface of the outer panel 43 towards the outer surface of the inner panel 44 and is welded at its end to the outer surface of the inner panel 44. It should be understood, however, that the welding rib 45 can also be provided inside the outer periphery of the inner panel 44 and extends from the outer surface of the inner panel 44 towards the inner surface of the outer panel 43 and is welded at its end to the inner surface of the outer panel 43. It should also be understood that the welding rib 45 can be provided inside the outer periphery of the outer panel 23 as well as inside the outer periphery of the inner panel 24, with the ends of the welding ribs 45 being welded to each other. Preferably as shown, the lid 4 is provided with two welding ribs 45 which are parallel to each other and spaced apart from each other. In the case where the lid 4 of the collapsible box 100 is made of plastic material, the welding between the welding rib 25 and the outer surface of the inner panel 44, the inner surface of the outer panel 43 or another welding rib 45 is achieved by ultrasonic welding so as to better achieve the sealing of the weld. Inside the space enclosed by the outer panel 43, the inner panel 44 and the welding rib 45, there is provided a thermal insulation layer 46. The provision of two spaced apart welding ribs 45 further ensures the sealing of the space enclosed by the outer panel, the inner panel and the welding rib with respect to the outside.

[0121] Figure 12 A bottom view of the lid 4 is shown. The lid 4 has four edges 41, 42, 47 and 48. Preferably, the first edge 41 is provided with a lid hinge portion 4111 and the outer panel 43 at the second edge 42 extends beyond the inner panel 44 and overlaps the inner side of the side panel 2 when the lid is closed. Specifically, as shown, the edge of the outer panel 43 can be provided with a snap edge 4a which can snap into an upwardly open groove 2a provided at the inner side of the side panel 2. In another embodiment, the outer panel at the second edge 42 is flush with the inner panel. At the other two edges 47 and 48, the outer panel 43 extends beyond the inner panel 44. Preferably, the portion of the outer panel 43 which extends beyond the inner panel 44 overlaps the side panel 3 when the collapsible box 100 is in use. Figure 4B

[0122] Figure 9B A cross-sectional view of the side 12 of the base 1 is shown. Figure 10 and 10A ​An exploded view and a detailed view of the base 1 are shown. As can be seen from the figures, the base 1 is formed by welding the base body 14 and the base bottom plate 15 together. The base body 14 is provided with a plate-shaped body cavity 142 and two pairs of opposite edge cavities 143, which are spaced apart by base welding ribs 141. The base body 14 includes a base plate 145, which is rectangular, and the edge 12 is formed by an edge inner plate 124 and an edge outer plate 123, which form the inner and outer surfaces of the edge 12, respectively. The edge inner plate 124 extends upwardly from the edge of the edge base plate 145, while the base welding ribs 141 extend downwardly from the edge of the edge base plate 145 and are welded to the upper surface of the base bottom plate 15. The lower end of the edge outer plate 123 is also welded to the upper surface of the base bottom plate 15, preferably to the edge of the upper surface of the base bottom plate 15. The edge inner plate 124 and the edge outer plate 123, together with the base welding ribs 141, form the edge cavities 143, while the base plate 145 and the base welding ribs 141 form the plate-shaped body cavity 142. A thermal insulation layer is provided in the edge cavities 143 and the plate-shaped body cavity 142, respectively. In addition, as mentioned above, the edge 12 is also provided with a plurality of recesses 121, and the portions of the edge 12 between the recesses 121 are also provided with a thermal insulation layer. The thermal insulation layer is typically made of light-weight foam.

[0123] The foldable box 100 with the above structure has good thermal insulation performance and can be used for storing fresh products.

[0124] According to the present application, in order to better form a seal and provide thermal insulation, a sealing structure can also be provided for the foldable box 100. As shown in detail in Figures 14-22A the sealing member 401 between the lid 4 and the side plates 2 and 3 is provided on the bottom side of the lid 4 and is fixedly connected to the lid 4. Specifically, the sealing member 401 is in the shape of a rectangular ring and has two pairs of opposite sides. The sealing member 401 is connected to the outer edge of the inner plate 44 of the lid 4. The sealing member 401 can be connected to the outer edge of the inner plate 44 in any suitable manner, for example, a plurality of protrusions can be provided on the outer edge of the inner plate 44, and a plurality of mating slots are provided on the sealing member 401, so that the sealing member 401 is clamped to the inner plate 44, or a plurality of protrusions are provided on the sealing member 401, and corresponding recesses are provided on the edge of the inner plate 44 for accommodating the protrusions. It is also envisaged that a protrusion can also be provided on the sealing member 401, and a corresponding groove is provided on the outer edge of the inner plate 44 to receive and retain the protrusion.

[0125] As shown in detail in Figure 19 the sealing member 401 between the lid 4 and the side plates 2 and 3 is provided on the bottom side of the lid 4 and is fixedly connected to the lid 4. Specifically, the sealing member 401 is in the shape of a rectangular ring and has two pairs of opposite sides. The sealing member 401 is connected to the outer edge of the inner plate 44 of the lid 4. The sealing member 401 can be connected to the outer edge of the inner plate 44 in any suitable manner, for example, a plurality of protrusions can be provided on the outer edge of the inner plate 44, and a plurality of mating slots are provided on the sealing member 401, so that the sealing member 401 is clamped to the inner plate 44, or a plurality of protrusions are provided on the sealing member 401, and corresponding recesses are provided on the edge of the inner plate 44 for accommodating the protrusions. It is also envisaged that a protrusion can also be provided on the sealing member 401, and a corresponding groove is provided on the outer edge of the inner plate 44 to receive and retain the protrusion.

[0126] In a preferred embodiment, the seal 401 of the lid 4 has a seal body 4011 and at least one row of mounting posts 4012 protruding from the seal body 4011, the ends of the mounting posts 4012 being provided with snaps. The lid 4 is provided with corresponding mounting holes, into which the snaps are snapped to mount the seal on the lid.

[0127] In Figure 20 In the preferred embodiment shown, in the use state of the foldable box 100, when the lid 4 is closed on the top opening, the pair of side edges of the seal 401 located at the edges 47 and 48 extend beyond the outer edges of the inner panels of the side panels 3, while the side edge located at the edge 42 is operatively abutted against the side panel 2. Preferably, the inner side of the top end of the side panel 2 not hinged with the lid 4 is provided with a recess 2a opening upward and toward the inside of the box, and the snap edge 4a of the seal 401 located at the edge 42 is operatively abutted against the recess 2a, as shown in Figure 20B .

[0128] Figure 20A A partial enlarged sectional view showing the hinge 5 hingedly connecting the lid 4 with one of the side panels 2 is shown in Figure 21 、 22 and 22A. As shown, a hinge seal 501 is connected to the underside of the hinge 5, the first side edge 5011 of the hinge seal 501 being operatively abutted against the side panel 2, wherein the first side edge 5011 is the side edge of the hinge seal 501 away from the lid 4. Preferably, the second side edge 5011 of the hinge seal 501 adjacent to the lid 4 at least partially overlaps the seal 401 on the lid 4.

[0129] The side panel 2 and the side panel 3 are also respectively provided with a seal 201 and a seal 301, Figure 15 and 15A A seal 201 of the side panel 2 is shown in Figure 16 and 16A A seal 301 of the side panel 2 is shown in. The side panel 2 and its seal 201 and the side panel 3 and its seal 301 are further shown in Figure 17 and 18 respectively.

[0130] As mentioned above, the bottom end of the side panel 2 is provided with a hinge protrusion 22 for forming a hinged connection with the recess 121 on the base 1. Preferably, the bottom end of the side panel 3 is also provided with a hinge protrusion 32, and in order to hingedly connect the side panel 3 to the base 1, a corresponding pair of edges of the base 1 is also provided with a guard 16, as shown in Figure 14 The guard 16 is also provided with a recess 161. The recess 161 and the hinge protrusion 32 can have the same structure as the recess 121 and the hinge protrusion 22 respectively, and will not be described here again.

[0131] In Figure 17 and 18 In the embodiment shown, the seal 201 of the side plate 2 is located only at the bottom of the side plate 2, while the seal 301 of the side plate 3 is in the form of a substantially rectangular ring, including portions located at the four edges of the side plate 3, respectively. Thus, the seal between the side plate 2 and the side plate 3 is achieved by the left and right edge portions of the seal 301 of the side plate 3. However, it should be understood that the seal 201 of the side plate 2 can also be in the form of a substantially rectangular ring, including portions located at the four edges of the side plate 2, respectively, while the seal 301 of the side plate 3 is located only at the bottom of the side plate 3, so that the seal between the side plate 2 and the side plate 3 is achieved by the left and right edges of the seal 201 of the side plate 2.

[0132] As shown in Figure 17 , the seal 201 at the bottom of the side plate 2 includes a plurality of "n" shaped portions in the middle and half "n" shaped portions on the two sides, wherein the two legs of each n-shaped portion cover the inner side surfaces of the adjacent two side plate limiting portions 221 of the adjacent two hinge extensions 22, respectively, and the half "n" shaped portions on the two sides cover the inner side surfaces of the outer end side plate limiting portions 221 of the hinge extensions 22 on the left and right sides of the side plate 2. Among them, the above-mentioned "n" shaped portions and half "n" shaped portions are separate seals from each other, and the number of "n" shaped portions is determined according to the number of hinge extensions 22. Specifically, the seal 201 is located on the left and right sides and the lower side of the hinge extensions and extends beyond the left and right sides and the lower side of the hinge extensions. In this way, the gap between the hinge extensions and the space between the hinge extensions and the bottom of the recess on the side plate can be effectively sealed, that is, the gap between the hinge extensions and the bottom of the recess on the side plate is covered. In an embodiment, vertical grooves 201a are provided at the left and right edges of the seal installed on the hinge extensions, and horizontal grooves 201b are provided at the lower edge, as shown in Figure 8A .

[0133] The portions of the seal 301 at the bottom of the side plate 3 have the same structure, which will not be described here. The structure of the portion of the seal 301 extending beyond the left and right sides and the lower side of the hinge extensions is shown in 18, which is a protruding ridge 301a and 301b relative to the main body of the seal. The seal 201 has a similar structure. The connection between the seals 201 and 301 and the side plates 2 and 3 can be any suitable manner, please refer to the description of the installation method of the seal 401 above. In an embodiment not shown, the seal between the bottom of the side plate and the recess of the base can also be provided in the recess of the base, or, the seal can be provided in both the bottom of the side plate and the recess of the base. The seal between the bottom of the side plate and the recess of the base is arranged to cover the gap between the hinge extensions and the bottom of the recess on the side plate.

[0134] As described above, in the preferred embodiment, each of the side panels 2 and 3 is provided with a bite 202 and 302 at each of its longitudinal ends, and each of the side panels 2 and 3 is connected to the other by the bites 202 and 302 engaging each other when each side panel is erected relative to the base 1. The seal 301 is connected to the bite 302 of the side panel 3 and extends laterally beyond the bite 302 so as to abut the side panel 2 to seal the joint between them when the side panels 2 and 3 are connected to each other in the use condition of the collapsible box 100. The connection between the seal 301 and the bite 302 can be achieved in any suitable manner, for example by providing a plurality of projections spaced apart from each other on the elongate plate-like body of the seal 301 at its longitudinal edges, and providing corresponding recesses in the side panel bite 302 for operatively securing the projections. In the case where the seal 201 comprises portions at each of the four edges, and the seal 301 is only at the bottom of the side panel 3, the seal 201 is connected to the bite 202 of the side panel 2 and extends laterally beyond the bite 202 so as to abut the side panel 3 to seal the joint between them when the side panels 2 and 3 are connected to each other in the use condition of the collapsible box 100. The connection between the seal 201 and the bite 202 can be achieved in any suitable manner, for example by providing a plurality of projections spaced apart from each other on the elongate plate-like body of the seal 201 at its longitudinal edges, and providing corresponding recesses in the side panel bite 202 for operatively securing the projections.

[0135] Figure 20 An enlarged view of detail A of the hinge 5 and its seal 501 is shown in Figure 4. Figure 22 An isometric view of the hinge 5 and its seal 501 assembled together is shown in Figure 5. Figure 22A An enlarged view of detail A of the hinge 5 and its seal 501 is shown in Figure 4. Figure 22 An enlarged view of detail A of the hinge 5 and its seal 501 is shown in Figure 4.

[0136] The preferred embodiments of the present application have been described in detail above, but it should be understood that modifications can be made to the embodiments, if necessary, to employ various patents, applications and publications, features and concepts described therein, to provide yet further embodiments.

[0137] These and other changes can be made to the embodiments in light of the above detailed description. In general, in the appended claims, the terms used should not be construed to limit the claimed embodiments to the specific embodiments disclosed in the specification and claims, but should be construed to include all embodiments falling within the scope of the claims along with the full equivalent thereof.

Claims

1. A foldable box having a box body and a box lid, wherein the box body has a base and side panels foldably connected to the base, the side panels including a pair of opposing first side panels and a pair of opposing second side panels, an edge of the box lid being hinged to a top end of the box body, characterised in that, The connection between the box cover and the first and second side plates, the connection between the base and the first and second side plates, and the connection between the first and second side plates are all provided with sealing members; The box cover is a single cover structure, a first edge of the box cover is hinged to a top end of one of the pair of first side plates by a hinge, the first edge of the box cover is provided with a box cover hinge part, and the top end of one of the pair of first side plates is provided with a side plate hinge part, wherein a first edge and a second edge of the hinge are respectively provided with a first main body hinge part and a second main body hinge part, the box cover hinge part and the first main body hinge part are hinged to each other, and the side plate hinge part and the second main body hinge part are hinged to each other; An inner side of a top end of the other of the pair of opposite first side plates is provided with a groove opening upward and toward the inside of the box, the groove receiving the second edge of the box cover in the use state; When the foldable box is in the storage state, the side plates are folded onto the base, the box cover is rotated and folded outward of the side plates, and the second edge of the box cover opposite to the first edge does not extend beyond the bottom end of the side plates; The box cover hinge part includes a plurality of box cover protrusions spaced from each other, each box cover protrusion extending horizontally from the edge of the box cover along the plane in which the box cover lies; the side plate hinge part includes a plurality of side plate protrusions spaced from each other, each side plate protrusion extending upward from the top end of the side plate along the plane in which the side plate lies; the first main body hinge part and the second main body hinge part respectively include a plurality of first main body protrusions and a plurality of second main body protrusions spaced from each other; each box cover protrusion and each first main body protrusion are staggered with each other and are hinged by a first hinge shaft; each side plate protrusion and each second main body protrusion are staggered with each other and are hinged by a second hinge shaft; The box cover is further provided such that the box cover is formed by welding an inner plate and an outer plate to each other, in the state of the box cover on the box, the outer plate of the box cover extending beyond the edge of the inner plate is lapped on the second side plate.

2. The foldable box according to claim 1, wherein, The sealing members between the box cover and the first and second side plates are provided on the bottom side of the box cover and are fixedly connected to the box cover.

3. The foldable box according to claim 1, wherein, The outer plate of the box cover extends beyond the edge of the inner plate at a pair of opposite edges of the box cover, one of the other pair of opposite edges is provided with a box cover hinge part, and the outer plate and the inner plate at the other edge are flush or also extend beyond the edge of the inner plate, and the sealing member on the box cover is connected to the inner plate.

4. The foldable box according to claim 1, wherein, The sealing member of the box cover is a ring-shaped member having two pairs of opposite sides, one pair of opposite sides of the sealing member of the box cover extends beyond the outer edge of the inner plate of the second side plate, and one of the other pair of opposite sides is operatively abutted against the first side plate.

5. The foldable box according to claim 1, wherein, A part of the sealing member of the box cover is operatively abutted against the groove.

6. The foldable box according to claim 1, wherein, The sealing member of the box cover has a sealing member main body and at least one row of mounting columns protruding from the sealing member main body, the end of the mounting column is provided with a buckle, the box cover has a corresponding mounting hole, and the buckle is buckled into the mounting hole.

7. The foldable box according to claim 1, wherein, The lower side of the hinge is connected with a hinge seal, the first side of the hinge seal is operatively abutted against the first side plate.

8. The foldable box according to claim 7, wherein, The second side of the hinge seal opposite to the first side overlaps the seal on the box cover.

9. The foldable box according to claim 1, wherein, The left and right side edges of the plate-shaped main body of the second side plate are provided with side plate engaging parts, the side plate engaging parts are connected with side plate seals, and the side plate seals extend beyond the side plate engaging parts.

10. The foldable box according to claim 9, wherein, The side plate seal has a long strip-shaped plate-shaped main body, a plurality of protrusions are arranged on the long strip-shaped plate-shaped main body and are spaced from each other, the side plate engaging part is provided with a corresponding groove, and the protrusions on the long strip-shaped plate-shaped main body are operatively fixed in the groove.

11. The foldable box according to claim 1, wherein, The first side plate and the second side plate each have a plate-shaped main body and a plurality of hinge protrusions which are spaced from each other and extend from the lower part of the plate-shaped main body, the base has a plate-shaped main body and two pairs of opposite flanges which extend upward from two pairs of opposite edges of the plate-shaped main body, the flanges are provided with cavities which are open upward and toward the inside of the box, and the cavities are provided with seals.

12. The foldable box according to claim 11, wherein, The seals installed on the hinge protrusions are located on the left and right sides and the lower side of the hinge protrusions and extend beyond the left and right sides and the lower side of the hinge protrusions.

13. The foldable box according to claim 1, wherein, The base has a plate-shaped main body and a pair of opposite flanges which extend upward from a pair of opposite edges of the plate-shaped main body, the flanges are provided with cavities which are open upward and toward the inside of the box, and the cavities are provided with base limiting parts which extend upward from the bottom wall of the cavities, the first side plate and the second side plate each have a plate-shaped main body and a plurality of hinge protrusions which are spaced from each other and extend from the lower part of the plate-shaped main body, the left and right side edges of the plate-shaped main body of the first side plate and / or the second side plate are provided with seals, and the bottom end of each hinge protrusion is provided with a side plate hinge shaft, wherein the side plate hinge shaft cooperates with the base limiting part, and the seals installed on the hinge protrusions are located on the left and right sides and the lower side of the hinge protrusions and extend beyond the left and right sides and the lower side of the hinge protrusions.

14. The foldable box according to any of claims 11-13, wherein, The left and right edges of the seals installed on the hinge protrusions are provided with vertical grooves and / or the lower edge is provided with a horizontal groove.

15. The foldable box according to claim 13, wherein, The flange is further provided with a base guide part which is located in the base limiting part and is open toward the inside, and each hinge protrusion is further provided with a side plate guide part which is located between the side plate hinge shafts and is slidably connected to the base guide part.

16. The foldable box according to claim 15, wherein, The base limiting part is a plate-shaped part, the base guide part is a groove which is arranged in the middle of the base limiting part, and the upper part of the side wall of the cavity is provided with a first base limiting protrusion.

17. The foldable box according to claim 15, wherein, The hinge protrusion has a plate-shaped main body, the side plate hinge shaft extends from the left and right sides of the bottom end of the plate-shaped main body and is directed toward a direction parallel to the side plate, and the side plate guide part is a guide block which extends from the plate-shaped main body and is directed in a direction perpendicular to the plate-shaped main body.

18. The foldable box according to claim 1, wherein, Each of the first side plate, the second side plate and the box cover is formed by welding an inner plate and an outer plate to each other, and a heat preservation layer is arranged between the inner plate and the outer plate; and the base has a plate-shaped main body and a guard edge extending upward from the periphery of the plate-shaped main body, and a heat preservation layer is arranged in the plate-shaped main body and the guard edge.

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