Quick assembling and fixing structure for injection molding travel suitcase and middle frame

Abstract

The utility model discloses a quick assembling and fixing structure of an injection molding travel suitcase and a middle frame, which comprises a first case shell, a second case shell, a first frame, a second frame, a first frame zipper and a second frame zipper, the main body of the first frame is arranged at the opening part of the first case shell, and the top of the first frame and the opening part of the first case shell are respectively provided with an inverted buckling structure; the top inverted buckle structure of the first frame and the opening inverted buckle structure of the first box shell are engaged with each other to achieve clamping and fixing. The main body of the second frame is arranged at the opening part of the second box shell, the top of the second frame and the opening part of the second box shell are respectively provided with an inverted buckling structure, and the inverted buckling structure at the top of the second frame and the inverted buckling structure at the opening part of the second box shell are mutually engaged to realize clamping and fixing; the inner side of the first frame zipper is connected with the first frame in a clamped mode, the inner side of the second frame zipper is connected with the second frame in a clamped mode, and the outer side of the first frame zipper and the outer side of the second frame zipper are mutually zipped to form a closed box body inner space.

Description

TECHNICAL FIELD

[0001] The utility model relates to a travel case technical field, especially a kind of quick assembly fixing structure of injection molding travel case and middle frame. BACKGROUND

[0002] In the currently commonly used travel case, a set of frame with concave-convex fitting is generally arranged on the opening edge of the case shell on its front and back sides, which aims to increase the use strength of the travel case and improve the closure matching degree and tightness of the case shell on both sides, facilitating user use.

[0003] The prior art uses rivet riveting to fix the frame bent into shape at the opening of the case shell, and the fixing method is simple in principle, which is most widely used in the industry at present, but it is inconvenient to operate and low in production efficiency in actual production and use, and riveting with rivets requires a via hole for rivets, so multiple via hole fixing points must be provided, resulting in more steps for binding and more pre-processes. When an overlapping hole is provided at the splicing overlapping position, misalignment often occurs and needs to be corrected manually, which is not easy to operate. Meanwhile, the riveting of rivets requires an operator to hold the box body to operate the riveting machine, and when the size of the box body is large, the operation convenience is very low, the worker is easily tired, and the production efficiency and safety are affected. Because the number of rivets is large, the production efficiency is low, thereby increasing the production cost of products.

[0004] The structure between the two rivets is weak in strength and prone to gaps, and even if the rivets are arranged densely, there will always be a certain distance between adjacent rivets, and this distance is not completely fixed, so the structure is low in strength, and the overall fixing strength is not ideal. When local collision deformation occurs, the frame and the case shell are easily separated to form gaps, thereby affecting the appearance and causing poor product experience for users.

[0005] The exposure of a large number of rivets affects the appearance of the travel case, and the rivets are exposed on the outside of the frame, and the number is large, thereby affecting the overall appearance of the travel case. UTILITY MODEL CONTENTS

[0006] In order to overcome the deficiencies in the prior art, the utility model provides a quick assembly fixing structure of injection molding travel case and middle frame, which can effectively increase the assembly efficiency of the frame and the case shell, improve the stable connection between the frame and the case shell, and improve the overall appearance of the luggage.

[0007] In order to achieve the above utility model purposes and solve the technical problems, the technical scheme adopted is as follows:

[0008] A kind of injection molding travel case and the quick assembly fixing structure of middle frame, including first case, second case, first frame, second frame, first frame zipper and second frame zipper, wherein:

[0009] The main body of the first frame is arranged at the mouth of the first case, the top of the first frame and the mouth of the first case are provided with reverse structure, the reverse structure of the top of the first frame and the reverse structure of the mouth of the first case are mutually engaged, the first case includes first case body, first case internal reinforcing portion, first case surface layer extension portion, wherein:

[0010] The first case internal reinforcing portion is fixedly connected to the left end of the first case body;

[0011] The first case surface layer extension portion is located above the first case internal reinforcing portion and extends obliquely left from the connection place of the first case internal reinforcing portion and the first case body;

[0012] The first case is fixedly connected with the first frame through the first case internal reinforcing portion and the first case surface layer extension portion;

[0013] The main body of the second frame is arranged at the mouth of the second case, the top of the second frame and the mouth of the second case are provided with reverse structure, the reverse structure of the top of the second frame and the reverse structure of the mouth of the second case are mutually engaged, the second case includes second case body, second case internal reinforcing portion, second case surface layer extension portion, wherein:

[0014] The second case internal reinforcing portion is fixedly connected to the right end of the second case body;

[0015] The second case surface layer extension portion is located above the second case internal reinforcing portion and extends obliquely right from the connection place of the second case internal reinforcing portion and the second case body;

[0016] The second case is fixedly connected with the second frame through the second case internal reinforcing portion and the second case surface layer extension portion;

[0017] The inner side of the first frame zipper is connected with the first frame, the inner side of the second frame zipper is connected with the second frame, and the outer side of the first frame zipper and the outer side of the second frame zipper are mutually pulled together to form a closed case internal space.

[0018] Further, the first case further includes first case end reverse portion and first case internal connecting rib, wherein:

[0019] The first case end reverse portion is fixedly connected to the left end of the first case surface layer extension portion and extends rightward;

[0020] The first box shell interior connecting rib is vertically connected between the first box shell interior reinforcing part and the first box shell surface layer extension part, and forms a first box shell interior reinforcing cavity with an opening to the left with the first box shell interior reinforcing part and the first box shell surface layer extension part;

[0021] The length of the first box shell interior reinforcing part is shorter than the length of the first box shell surface layer extension part;

[0022] The second box shell further comprises a second box shell end part reverse buckle part and a second box shell interior connecting rib, wherein:

[0023] The second box shell end part reverse buckle part is fixedly connected to the right end of the second box shell surface layer extension part and extends to the left;

[0024] The second box shell interior connecting rib is vertically connected between the second box shell interior reinforcing part and the second box shell surface layer extension part, and forms a second box shell interior reinforcing cavity with an opening to the right with the second box shell interior reinforcing part and the second box shell surface layer extension part;

[0025] The length of the second box shell interior reinforcing part is shorter than the length of the second box shell surface layer extension part.

[0026] Further, the first box shell further comprises a first box shell clamping strip, a first box shell fastener, and a first box shell interior connecting rib, wherein:

[0027] The first box shell clamping strip is in an L-shaped structure, the vertical part of which abuts against the left end of the first box shell surface layer extension part, and the horizontal part of which abuts against the outer surface of the first box shell surface layer extension part, and the first box shell clamping strip and the first box shell surface layer extension part are fixedly connected through the first box shell fastener;

[0028] The right end of the first box shell clamping strip is inclined upward;

[0029] The first box shell interior connecting rib is vertically connected between the first box shell interior reinforcing part and the first box shell surface layer extension part, and forms a first box shell interior reinforcing cavity with an opening to the left with the first box shell interior reinforcing part and the first box shell surface layer extension part;

[0030] The length of the first box shell interior reinforcing part is shorter than the length of the first box shell surface layer extension part;

[0031] The second box shell further comprises a second box shell clamping strip, a second box shell fastener, and a second box shell interior connecting rib, wherein:

[0032] The second box shell clamping strip is in L-shaped structure, the vertical part of which is in abutment with the right end of the second box shell surface layer extension part, the horizontal part of which is in abutment with the outer surface of the second box shell surface layer extension part, and the second box shell clamping strip and the second box shell surface layer extension part are fixedly connected through the second box shell fastener;

[0033] The left end of the second box shell clamping strip is inclined upward;

[0034] The second box shell internal connecting rib is vertically connected between the second box shell internal reinforcing part and the second box shell surface layer extension part, and the second box shell internal reinforcing part and the second box shell surface layer extension part enclose a second box shell internal reinforcing cavity with an opening to the right;

[0035] The length of the second box shell internal reinforcing part is shorter than the length of the second box shell surface layer extension part.

[0036] Further, the first frame comprises a first frame right side extension part, a first frame inner lining zipper installation slot, a first frame steel wire installation slot, a first frame left side supporting rib, a first frame zipper installation slot, a first frame top reverse buckle part, a first frame clamping and assembling slot, a first frame right side convex rib, and a first frame internal reinforcing part groove, wherein:

[0037] The first frame right side extension part is arranged below the right side of the first frame and is in inclined state with the left side being higher than the right side, so as to facilitate the introduction of the first box shell internal reinforcing part;

[0038] The first frame inner lining zipper installation slot is arranged in the middle part of the first frame and has an opening facing downward, so as to accommodate the internal lining;

[0039] The first frame steel wire installation slot is arranged below the middle part of the first frame and has an opening facing downward, so as to accommodate the internal lining fixing steel wire, and the internal lining fixing part wrapped around the periphery of the internal lining fixing steel wire is connected with the first frame;

[0040] The first frame left side supporting rib is arranged below the left side of the first frame, so as to support the first frame zipper and the second frame zipper together with the second frame;

[0041] The first frame zipper installation slot is arranged in the middle part of the first frame and has an opening facing the left side, so as to accommodate the inner side of the first frame zipper;

[0042] The first frame top reverse buckle part is transversely arranged in the upper part of the first frame;

[0043] The first frame clamping and assembling slot is arranged in the upper part of the first frame and has an opening facing the right side, so as to clamp the mouth part of the first box shell;

[0044] The first frame right side protruding rib is arranged below the right side of the first frame and above the first frame right side extension, and is used for extending into the internal reinforcing cavity of the first box shell when the first box shell is clamped into the first frame;

[0045] The first frame internal reinforcing part groove is arranged on the right side of the first frame and is formed by the first frame right side protruding rib, the first frame and the first frame right side extension, and is used for fixing the first box shell internal reinforcing part;

[0046] The second frame includes a second frame left side extension, a second frame internal lining zipper installation slot, a second frame steel wire installation slot, a second frame right side supporting rib, a second frame zipper installation slot, a second frame top reverse buckle part, a second frame clamping assembly slot, a second frame left side protruding rib and a second frame internal reinforcing part groove, wherein:

[0047] The second frame left side extension is arranged below the left side of the second frame and is in an inclined state of being low on the left side and high on the right side, and is used for facilitating the introduction of the second box shell internal reinforcing part;

[0048] The second frame internal lining zipper installation slot is arranged in the middle of the second frame and has an opening facing downward, and is used for accommodating the internal lining;

[0049] The second frame steel wire installation slot is arranged below the middle of the second frame and has an opening facing downward, and is used for accommodating the internal lining fixing steel wire, and then connecting the internal lining fixing part surrounding the internal lining fixing steel wire and the second frame;

[0050] The second frame right side supporting rib is arranged below the right side of the second frame, and is used for supporting the first frame zipper and the second frame zipper together with the first frame;

[0051] The second frame zipper installation slot is arranged in the middle of the second frame and has an opening facing the right side, and is used for accommodating the inside of the second frame zipper;

[0052] The second frame top reverse buckle part is arranged horizontally on the upper part of the second frame;

[0053] The second frame clamping assembly slot is arranged on the upper part of the second frame and has an opening facing the left side, and is used for clamping the mouth part of the second box shell;

[0054] The second frame left side protruding rib is arranged below the left side of the second frame and above the second frame left side extension, and is used for extending into the internal reinforcing cavity of the second box shell when the second box shell is clamped into the second frame;

[0055] The second frame interior reinforcing part groove is arranged on the left side of the second frame, is enclosed by the second frame left side protruding rib, the second frame and the second frame left side extension, and is used for fixing the second case interior reinforcing part.

[0056] Preferably, the transverse length of the first frame right side protruding rib is less than or equal to the transverse depth of the first case interior reinforcing cavity; and / or, the transverse length of the second frame left side protruding rib is less than or equal to the transverse depth of the second case interior reinforcing cavity.

[0057] Further, the first case further comprises a first case clamping strip, a first case fastener, and a first case interior connecting rib, wherein:

[0058] The first case clamping strip is in L-shaped structure, the vertical part of which abuts against the left end of the first case interior reinforcing part, the horizontal part of which abuts against the upper surface of the first case interior reinforcing part, and the first case clamping strip and the first case interior reinforcing part are fixedly connected through the first case fastener;

[0059] The right end of the first case clamping strip is upwardly inclined;

[0060] The first case interior connecting rib is vertically connected between the first case interior reinforcing part and the first case surface layer extension, and encloses the first case interior reinforcing part and the first case surface layer extension to form a first case interior reinforcing cavity which is open to the left;

[0061] The length of the first case interior reinforcing part is longer than the length of the first case surface layer extension;

[0062] The second case further comprises a second case clamping strip, a second case fastener, and a second case interior connecting rib, wherein:

[0063] The second case clamping strip is in L-shaped structure, the vertical part of which abuts against the right end of the second case interior reinforcing part, the horizontal part of which abuts against the upper surface of the second case interior reinforcing part, and the second case clamping strip and the second case interior reinforcing part are fixedly connected through the second case fastener;

[0064] The left end of the second case clamping strip is upwardly inclined;

[0065] The second case interior connecting rib is vertically connected between the second case interior reinforcing part and the second case surface layer extension, and encloses the second case interior reinforcing part and the second case surface layer extension to form a second case interior reinforcing cavity which is open to the right;

[0066] The length of the second case interior reinforcing part is longer than the length of the second case surface layer extension.

[0067] Further, the first frame comprises a first frame right side extension, a first frame inner lining zipper installation slot, a first frame steel wire installation slot, a first frame left side support rib, a first frame zipper installation slot, a first frame top reverse buckle portion, and a first frame clamping assembly slot, wherein:

[0068] The first frame right side extension is arranged on the right side of the first frame and is in a horizontal state, and is used for guiding the first box shell;

[0069] The first frame inner lining zipper installation slot is arranged at a right side of the middle part of the first frame, and the opening thereof faces downward, and is used for accommodating the internal lining;

[0070] The first frame steel wire installation slot is arranged at the middle part of the first frame, and the opening thereof faces downward, and is used for accommodating the lining fixing steel wire, so as to connect the internal lining fixing portion wrapped around the periphery of the lining fixing steel wire and the first frame;

[0071] The first frame left side support rib is arranged below the left side of the first frame, and is used for jointly supporting the first frame zipper and the second frame zipper with the second frame;

[0072] The first frame zipper installation slot is arranged at a left side of the middle part of the first frame, and the opening thereof faces the left side, and is used for accommodating the inner side of the first frame zipper;

[0073] The first frame top reverse buckle portion is arranged horizontally at the upper part of the first frame;

[0074] The first frame clamping assembly slot is arranged at the upper part of the first frame, and the opening thereof faces the right side, and is used for clamping the first box shell;

[0075] The second frame comprises a second frame left side extension, a second frame inner lining zipper installation slot, a second frame steel wire installation slot, a second frame right side support rib, a second frame zipper installation slot, a second frame top reverse buckle portion, and a second frame clamping assembly slot, wherein:

[0076] The second frame left side extension is arranged on the left side of the second frame and is in a horizontal state, and is used for guiding the second box shell;

[0077] The second frame inner lining zipper installation slot is arranged at a left side of the middle part of the second frame, and the opening thereof faces downward, and is used for accommodating the internal lining;

[0078] The second frame steel wire installation slot is arranged at the middle part of the second frame, and the opening thereof faces downward, and is used for accommodating the lining fixing steel wire, so as to connect the internal lining fixing portion wrapped around the periphery of the lining fixing steel wire and the first frame;

[0079] The second frame right side supporting rib is arranged below the right side of the second frame, and is used for supporting the first frame zipper and the second frame zipper together with the first frame;

[0080] The second frame zipper mounting groove is arranged at the right side of the middle part of the second frame, and the opening thereof faces the right side, and is used for accommodating the inner side of the second frame zipper;

[0081] The second frame top reverse buckle part is arranged at the upper part of the second frame in the transverse direction;

[0082] The second frame clamping assembly groove is arranged at the upper part of the second frame, and the opening thereof faces the left side, and is used for clamping the second box shell.

[0083] Further, the first frame top reverse buckle part comprises a first frame top reverse buckle part outer side abutting part, a first frame top reverse buckle part inner side abutting part and a first frame top reverse buckle part outward extending part, when the first box shell is buckled with the first frame:

[0084] The first frame top reverse buckle part outer side abutting part abuts against the left end of the first box shell surface layer extending part;

[0085] The first frame top reverse buckle part inner side abutting part abuts against the right end of the first box shell clamping strip;

[0086] The first frame top reverse buckle part outward extending part abuts against the left side of the first box shell internal connecting rib;

[0087] The second frame top reverse buckle part comprises a second frame top reverse buckle part outer side abutting part, a second frame top reverse buckle part inner side abutting part and a second frame top reverse buckle part outward extending part, when the second box shell is buckled with the second frame:

[0088] The second frame top reverse buckle part outer side abutting part abuts against the right end of the second box shell surface layer extending part;

[0089] The second frame top reverse buckle part inner side abutting part abuts against the left end of the second box shell clamping strip;

[0090] The second frame top reverse buckle part outward extending part abuts against the right side of the second box shell internal connecting rib.

[0091] Preferably, the first frame lining zipper mounting groove, the first frame steel wire mounting groove and the first frame zipper mounting groove are located at the same horizontal position; and / or,

[0092] The second frame lining zipper mounting groove, the second frame steel wire mounting groove and the second frame zipper mounting groove are located at the same horizontal position.

[0093] Preferably, the lateral width of the first frame clamping assembly slot and the lateral width of the first box shell clamping strip are matched to prevent the connection between the first box shell and the first frame from loosening; and / or,

[0094] The lateral width of the second frame clamping assembly slot and the lateral width of the second box shell clamping strip are matched to prevent the connection between the second box shell and the second frame from loosening.

[0095] The utility model discloses a kind of quick assembly fixing structure of injection molding travel case and middle frame, after installation, the reverse buckle of frame and box shell is mutually tightly matched, effectively guarantee the connection stability between frame and box shell, no longer need to be linked by rivet or other mode, improve the overall aesthetic property and assembly efficiency of travel case.

[0096] 1, the utility model discloses a kind of quick assembly fixing structure of injection molding travel case and middle frame, after installation, the reverse buckle of frame and box shell is mutually tightly matched, effectively guarantee the connection stability between frame and box shell, no longer need to be linked by rivet or other mode, improve the overall aesthetic property and assembly efficiency of travel case.

[0097] 2, the utility model discloses a kind of quick assembly fixing structure of injection molding travel case and middle frame, the lateral width of the frame clamping assembly slot and the lateral width of box shell buckle (clamping strip) are matched to prevent the connection between box shell and frame from loosening, to enhance the clamping strength of frame and box shell and then reduce the risk of separation of frame and box shell.

[0098] 3, the utility model discloses a kind of quick assembly fixing structure of injection molding travel case and middle frame, structure is reasonable, design is ingenious, convenient operation, production efficiency is high, stability is strong, manufacturing cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0099] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the drawings needed to be used in embodiment description simple introduction. Obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings. In the drawings:

[0100] Figure 1 It is the three-dimensional schematic diagram of the quick assembly fixing structure of injection molding travel case and middle frame of the utility model;

[0101] Figure 2 It is the side schematic diagram of the quick assembly fixing structure of injection molding travel case and middle frame of the utility model;

[0102] Figure 3 It is the overall structure schematic diagram of embodiment one of the utility model;

[0103] Figure 4 It is the overall structure exploded schematic diagram of embodiment one of the utility model;

[0104] Figure 5 is the assembly process schematic view of the first box shell and the first frame in the embodiment one of the utility model;

[0105] Figure 6 is the whole structure schematic view of the embodiment two of the utility model;

[0106] Figure 7 is the whole structure exploded schematic view of the embodiment two of the utility model;

[0107] Figure 8 is the assembly process schematic view of the first box shell and the first frame in the embodiment two of the utility model;

[0108] Figure 9 is the whole structure schematic view of the embodiment three of the utility model;

[0109] Figure 10 is the whole structure exploded schematic view of the embodiment three of the utility model;

[0110] Figure 11 is the assembly process schematic view of the first box shell and the first frame in the embodiment three of the utility model.

[0111]

Main symbol explanation

[0112] 1-first box shell;11-first box shell body;12-first box shell internal reinforcing portion;13-first box shell surface layer extension portion;14-first box shell end portion reverse buckle portion;15-first box shell internal connecting rib;16-first box shell clamping strip;17-first box shell fastener;

[0113] 2-second box shell;21-second box shell body;22-second box shell internal reinforcing portion;23-second box shell surface layer extension portion;24-second box shell end portion reverse buckle portion;25-second box shell internal connecting rib;26-second box shell clamping strip;27-second box shell fastener;

[0114] 3-first frame;31-first frame right side extension portion;32-first frame inner lining zip fastener installation groove;33-first frame steel wire installation groove;34-first frame left side support rib;35-first frame zip fastener installation groove;36-first frame top reverse buckle portion;361-first frame top reverse buckle portion outside abutment portion;362-first frame top reverse buckle portion inside abutment portion;363-first frame top reverse buckle portion outward extension portion;37-first frame clamping assembly groove;38-first frame right side convex rib;39-first frame internal reinforcing portion recess;

[0115] 4 - second frame; 41 - second frame left side extension; 42 - second frame inner lining zip mounting groove; 43 - second frame steel wire mounting groove; 44 - second frame right side support rib; 45 - second frame zip mounting groove; 46 - second frame top undercut; 461 - second frame top undercut outer side abutment; 462 - second frame top undercut inner side abutment; 463 - second frame top undercut outward extension; 47 - second frame snap fitting groove; 48 - second frame left side protruding rib; 49 - second frame inner reinforcing groove;

[0116] 5 - first frame zip;

[0117] 6 - second frame zip;

[0118] 7 - inner lining;

[0119] 8 - lining fixing steel wire;

[0120] 9 - inner lining fixing portion. DETAILED DESCRIPTION

[0121] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0122] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0123] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0124] As Figures 1-11As shown, the embodiment discloses a kind of quick assembly fixing structure of injection molding travel case and middle frame, including first box shell 1, second box shell 2, first frame 3, second frame 4, first frame zipper 5 and second frame zipper 6, wherein:

[0125] The main body of the first frame 3 is arranged at the mouth of the first box shell 1, and the top of the first frame 3 and the mouth of the first box shell 1 are both provided with an undercut structure, the top undercut structure of the first frame 3 and the mouth undercut structure of the first box shell 1 are mutually engaged, and the first box shell 1 includes a first box shell body 11, a first box shell internal reinforcing portion 12 and a first box shell surface layer extension portion 13, wherein:

[0126] The first box shell internal reinforcing portion 12 is fixedly connected to the left end of the first box shell body 11;

[0127] The first box shell surface layer extension portion 13 is located above the first box shell internal reinforcing portion 12 and extends obliquely to the left from the connection between the first box shell internal reinforcing portion 12 and the first box shell body 11;

[0128] The first box shell 1 is clamped and fixed with the first frame 3 through the first box shell internal reinforcing portion 12 and the first box shell surface layer extension portion 13;

[0129] Preferably, the first box shell body 11, the first box shell internal reinforcing portion 12 and the first box shell surface layer extension portion 13 are integrally formed or stamp-formed, effectively increasing the service life of the first box shell 1.

[0130] The main body of the second frame 4 is arranged at the mouth of the second box shell 2, and the top of the second frame 4 and the mouth of the second box shell 2 are both provided with an undercut structure, the top undercut structure of the second frame 4 and the mouth undercut structure of the second box shell 2 are mutually engaged, and the second box shell 2 includes a second box shell body 21, a second box shell internal reinforcing portion 22 and a second box shell surface layer extension portion 23, wherein:

[0131] The second box shell internal reinforcing portion 22 is fixedly connected to the right end of the second box shell body 21;

[0132] The second box shell surface layer extension portion 23 is located above the second box shell internal reinforcing portion 22 and extends obliquely to the right from the connection between the second box shell internal reinforcing portion 22 and the second box shell body 21;

[0133] The second box shell 2 is clamped and fixed with the second frame 4 through the second box shell internal reinforcing portion 22 and the second box shell surface layer extension portion 23;

[0134] Preferably, the second box body 21, the second box internal reinforcing part 22 and the second box surface layer extension part 23 are integrally formed or stamped, effectively increasing the service life of the second box 2.

[0135] The inner side of the first frame zipper 5 is clamped with the first frame 3, the inner side of the second frame zipper 6 is clamped with the second frame 4, and the outer sides of the first frame zipper 5 and the second frame zipper 6 are pulled together to form a closed box interior space.

[0136] Embodiment one

[0137] Reference Figures 3-5 The first box 1 further comprises a first box end undercut part 14 and a first box internal connecting rib 15, wherein:

[0138] The first box end undercut part 14 is fixedly connected to the left end of the first box surface layer extension part 13 and extends to the right;

[0139] The first box internal connecting rib 15 is vertically connected between the first box internal reinforcing part 12 and the first box surface layer extension part 13, and forms a first box internal reinforcing cavity with the first box internal reinforcing part 12 and the first box surface layer extension part 13, which is open to the left;

[0140] The length of the first box internal reinforcing part 12 is shorter than the length of the first box surface layer extension part 13;

[0141] The second box 2 further comprises a second box end undercut part 24 and a second box internal connecting rib 25, wherein:

[0142] The second box end undercut part 24 is fixedly connected to the right end of the second box surface layer extension part 23 and extends to the left;

[0143] The second box internal connecting rib 25 is vertically connected between the second box internal reinforcing part 22 and the second box surface layer extension part 23, and forms a second box internal reinforcing cavity with the second box internal reinforcing part 22 and the second box surface layer extension part 23, which is open to the right;

[0144] The length of the second box internal reinforcing part 22 is shorter than the length of the second box surface layer extension part 23.

[0145] In the embodiment, the first box body 11, the first box internal reinforcing part 12, the first box surface layer extension part 13 and the first box end undercut part 14 are integrally formed or stamping formed, and / or the second box body 21, the second box internal reinforcing part 22, the second box surface layer extension part 23 and the second box end undercut part 24 are integrally formed or stamping formed, effectively increasing the service life of the first box 1 and / or the second box 2.

[0146] Embodiment two

[0147] Reference Figures 6-8 The first box 1 further comprises a first box clamping strip 16, a first box fastener 17, and a first box internal connecting rib 15, wherein:

[0148] The first box clamping strip 16 is in L-shaped structure, the vertical part of which abuts against the left end of the first box surface layer extension part 13, and the horizontal part of which abuts against the outer surface of the first box surface layer extension part 13, and the first box clamping strip 16 and the first box surface layer extension part 13 are fixedly connected through the first box fastener 17;

[0149] The right end of the first box clamping strip 16 is upwardly inclined;

[0150] The first box internal connecting rib 15 is vertically connected between the first box internal reinforcing part 12 and the first box surface layer extension part 13, and forms a first box internal reinforcing cavity with an opening to the left together with the first box internal reinforcing part 12 and the first box surface layer extension part 13;

[0151] The length of the first box internal reinforcing part 12 is shorter than the length of the first box surface layer extension part 13;

[0152] The second box 2 further comprises a second box clamping strip 26, a second box fastener 27, and a second box internal connecting rib 25, wherein:

[0153] The second box clamping strip 26 is in L-shaped structure, the vertical part of which abuts against the right end of the second box surface layer extension part 23, and the horizontal part of which abuts against the outer surface of the second box surface layer extension part 23, and the second box clamping strip 26 and the second box surface layer extension part 23 are fixedly connected through the second box fastener 27;

[0154] The left end of the second box clamping strip 26 is upwardly inclined;

[0155] The second box internal connecting rib 25 is vertically connected between the second box internal reinforcing part 22 and the second box surface layer extension part 23, and forms a second box internal reinforcing cavity with an opening to the right together with the second box internal reinforcing part 22 and the second box surface layer extension part 23;

[0156] The length of the second box shell internal reinforcing portion 22 is shorter than the length of the second box shell surface layer extension portion 23.

[0157] In combination with Embodiments One and Two, the first frame 3 comprises a first frame right side extension portion 31, a first frame internal lining zipper installation slot 32, a first frame steel wire installation slot 33, a first frame left side support rib 34, a first frame zipper installation slot 35, a first frame top reverse buckle portion 36, a first frame clamping assembly slot 37, a first frame right side convex rib 38, and a first frame internal reinforcing portion groove 39, wherein:

[0158] The first frame right side extension portion 31 is arranged below the right side of the first frame 3 and is in an inclined state with the left side being higher than the right side, so as to facilitate the introduction of the first box shell internal reinforcing portion 12;

[0159] The first frame internal lining zipper installation slot 32 is arranged in the middle portion of the first frame 3 and has an opening facing downward, so as to accommodate the internal lining 7;

[0160] The first frame steel wire installation slot 33 is arranged below the middle portion of the first frame 3 and has an opening facing downward, so as to accommodate the internal lining fixing steel wire 8, and the internal lining fixing portion 9 wrapped around the periphery of the internal lining fixing steel wire 8 is connected to the first frame 3;

[0161] The first frame left side support rib 34 is arranged below the left side of the first frame 3, so as to jointly support the first frame zipper 5 and the second frame zipper 6 with the second frame 4;

[0162] The first frame zipper installation slot 35 is arranged in the middle portion of the first frame 3 and has an opening facing the left side, so as to accommodate the inner side of the first frame zipper 5;

[0163] The first frame top reverse buckle portion 36 is arranged horizontally in the upper portion of the first frame 3, so as to clamp the first box shell end reverse buckle portion 14 or the first box shell clamping strip 16 when the first box shell 1 is clamped into the first frame 3;

[0164] The first frame clamping assembly slot 37 is arranged in the upper portion of the first frame 3 and has an opening facing the right side, so as to clamp the mouth portion of the first box shell 1;

[0165] The first frame right side convex rib 38 is arranged below the right side of the first frame 3 and above the first frame right side extension portion 31, so as to extend into the first box shell internal reinforcing cavity when the first box shell 1 is clamped into the first frame 3;

[0166] The first frame interior reinforcing part groove 39 is arranged on the right side of the first frame 3, is formed by the first frame right side protruding rib 38, the first frame 3 and the first frame right side extension 31, and is used for fixing the first box shell interior reinforcing part 12;

[0167] The second frame 4 comprises a second frame left side extension 41, a second frame inner lining zipper mounting groove 42, a second frame steel wire mounting groove 43, a second frame right side supporting rib 44, a second frame zipper mounting groove 45, a second frame top reverse buckling part 46, a second frame clamping assembly groove 47, a second frame left side protruding rib 48 and a second frame interior reinforcing part groove 49.

[0168] The second frame left side extension 41 is arranged below the left side of the second frame 4, is in an inclined state with the left side being lower and the right side being higher, and is used for facilitating the introduction of the second box shell interior reinforcing part 22.

[0169] The second frame inner lining zipper mounting groove 42 is arranged in the middle part of the second frame 4, and the opening thereof faces downward, and is used for accommodating the interior inner lining 7.

[0170] The second frame steel wire mounting groove 43 is arranged below the middle part of the second frame 4, and the opening thereof faces downward, and is used for accommodating the inner lining fixing steel wire 8, and further connecting the interior inner lining fixing part 9 wrapped around the periphery of the inner lining fixing steel wire 8 and the second frame 4.

[0171] The second frame right side supporting rib 44 is arranged below the right side of the second frame 4, and is used for supporting the first frame zipper 5 and the second frame zipper 6 together with the first frame 3.

[0172] The second frame zipper mounting groove 45 is arranged in the middle part of the second frame 4, and the opening thereof faces the right side, and is used for accommodating the inner side of the second frame zipper 6.

[0173] The second frame top reverse buckling part 46 is arranged horizontally in the upper part of the second frame 4, and is used for clamping the second box shell end reverse buckling part 24 or the second box shell clamping strip 26 when the second box shell 2 is clamped into the second frame 4.

[0174] The second frame clamping assembly groove 47 is arranged in the upper part of the second frame 4, and the opening thereof faces the left side, and is used for clamping the mouth part of the second box shell 2.

[0175] The second frame left side protruding rib 48 is arranged below the left side of the second frame 4, and is located above the second frame left side extension 41, and is used for extending into the second box shell interior reinforcing cavity when the second box shell 2 is clamped into the second frame 4.

[0176] The internal reinforcement groove 49 of the second frame is located on the left side of the second frame 4 and is formed by the left side protrusion 48 of the second frame, the second frame 4 and the left side extension 41 of the second frame, and is used to fix the internal reinforcement 22 of the second box shell.

[0177] Preferably, the lateral length of the right-side rib 38 of the first frame is less than or equal to the lateral depth of the internal reinforcing cavity of the first housing; and / or, the lateral length of the left-side rib 48 of the second frame is less than or equal to the lateral depth of the internal reinforcing cavity of the second housing.

[0178] The specific working principle of Example 1 / 2:

[0179] like Figure 5 As shown in Figure 8, taking the first housing 1 and the first frame 3 as an example, insert the first housing 1 into the first frame 3 in the direction of the arrow to the left. Slight force needs to be applied to the first frame 3. The undercut 14 (or the first housing clip 16) at the end of the first housing and the surface extension 13 of the first housing first move along the right-side protruding rib 38 of the first frame (which is inclined from left to right) towards the first frame mounting groove 37. Simultaneously, the internal reinforcement 12 of the first housing moves to the left along the right-side extension 31 of the first frame, thereby causing the top undercut 36 of the first frame to be engaged by the undercut 14 (or the first housing clip 16). As the first box shell 16) is pushed upward, the first box shell end buckle 14 (or the first box shell retaining strip 16) and the first box shell surface extension 13 pass through the right entrance of the first frame snap-fit ​​assembly groove 37 in sequence. Then, the first box shell end buckle 14 (or the first box shell retaining strip 16) abuts against the inner side of the first frame top buckle 36. At the same time, the right side protruding rib 38 of the first frame is inserted into the reinforcing cavity inside the first box shell with the opening to the left, and abuts against the left side of the connecting rib 15 inside the first box shell, forming a mutually snapped state. At this time, the first box shell 1 is snapped and fixed in the first frame snap-fit ​​assembly groove 37 and cannot be removed.

[0180] Similarly, taking the second case shell 2 and the second frame 4 as an example, the second case shell 2 is inserted into the second frame 4 in the arrow direction to the right, and a little force is needed to insert the second case shell 2 into the second frame 4. The second case shell end inverted portion 24 (or the second case shell clamping strip 26) and the second case shell surface layer extension portion 23 first move along the second frame left side protruding rib 48 in a right high and left low inclined state to the second frame clamping assembly groove 47, and the second case shell internal reinforcing portion 22 simultaneously moves to the right along the second frame left side extension portion 41, so that the second frame top inverted portion 46 is lifted up by the second case shell end inverted portion 24 (or the second case shell clamping strip 26), and the second case shell end inverted portion 24 (or the second case shell clamping strip 26) and the second case shell surface layer extension portion 23 pass through the left side entrance of the second frame clamping assembly groove 47 in sequence, and the second case shell end inverted portion 24 (or the second case shell clamping strip 26) abuts against the inner side of the second frame top inverted portion 46, at the same time, the second frame left side protruding rib 48 is inserted into the second case shell internal reinforcing cavity with the opening to the right, and abuts against the right side of the second case shell internal connecting rib 25, forming a mutual clamping state, at this time, the second case shell 2 is clamped and fixed in the second frame clamping assembly groove 47 and cannot be taken out.

[0181] Embodiment three

[0182] Reference Figures 9-11 The first case shell 1 further comprises a first case shell clamping strip 16, a first case shell fastener 17, and a first case shell internal connecting rib 15, wherein:

[0183] The first case shell clamping strip 16 is in an L-shaped structure, the vertical part of which abuts against the left end of the first case shell internal reinforcing portion 12, and the horizontal part of which abuts against the upper surface of the first case shell internal reinforcing portion 12, and the first case shell clamping strip 16 and the first case shell internal reinforcing portion 12 are fixedly connected through the first case shell fastener 17;

[0184] The right end of the first case shell clamping strip 16 is inclined upward;

[0185] The first case shell internal connecting rib 15 is vertically connected between the first case shell internal reinforcing portion 12 and the first case shell surface layer extension portion 13, and the first case shell internal reinforcing portion 12 and the first case shell surface layer extension portion 13 enclose a first case shell internal reinforcing cavity with an opening to the left;

[0186] The length of the first case shell internal reinforcing portion 12 is longer than the length of the first case shell surface layer extension portion 13;

[0187] The second case shell 2 further comprises a second case shell clamping strip 26, a second case shell fastener 27, and a second case shell internal connecting rib 25, wherein:

[0188] The second box shell clamping strip 26 is in L-shaped structure, the vertical part of which is in abutment with the right end of the second box shell inner reinforcing part 22, the horizontal part of which is in abutment with the upper surface of the second box shell inner reinforcing part 22, and the second box shell clamping strip 26 and the second box shell inner reinforcing part 22 are fixedly connected through the second box shell fastener 27;

[0189] The left end of the second box shell clamping strip 26 is inclined upward;

[0190] The second box shell inner connecting rib 25 is vertically connected between the second box shell inner reinforcing part 22 and the second box shell surface layer extension part 23, and the second box shell inner reinforcing part 22 and the second box shell surface layer extension part 23 are enclosed to form a second box shell inner reinforcing cavity with an opening to the right;

[0191] The length of the second box shell inner reinforcing part 22 is longer than the length of the second box shell surface layer extension part 23.

[0192] Further, the first frame 3 comprises a first frame right side extension part 31, a first frame inner lining zipper installation slot 32, a first frame steel wire installation slot 33, a first frame left side supporting rib 34, a first frame zipper installation slot 35, a first frame top reverse buckling part 36, and a first frame clamping and assembling slot 37, wherein:

[0193] The first frame right side extension part 31 is arranged at the right side of the first frame 3 in horizontal state, and is used for guiding the first box shell 1;

[0194] The first frame inner lining zipper installation slot 32 is arranged at the right side of the middle part of the first frame 3, and the opening thereof faces downward, and is used for accommodating the internal lining 7;

[0195] The first frame steel wire installation slot 33 is arranged at the middle part of the first frame 3, and the opening thereof faces downward, and is used for accommodating the internal lining fixed steel wire 8, and further connecting the internal lining fixed part 9 wrapped around the periphery of the internal lining fixed steel wire 8 and the first frame 3;

[0196] The first frame left side supporting rib 34 is arranged below the left side of the first frame 3, and is used for commonly supporting the first frame zipper 5 and the second frame zipper 6 with the second frame 4;

[0197] The first frame zipper installation slot 35 is arranged at the left side of the middle part of the first frame 3, and the opening thereof faces the left side, and is used for accommodating the inner side of the first frame zipper 5;

[0198] The first frame top reverse buckling part 36 is transversely arranged at the upper part of the first frame 3;

[0199] The first frame clamping assembly groove 37 is arranged on the upper part of the first frame 3, and its opening faces the right side, used for clamping the first box shell 1;

[0200] The second frame 4 includes a second frame left extension 41, a second frame inner lining zipper installation groove 42, a second frame steel wire installation groove 43, a second frame right side support rib 44, a second frame zipper installation groove 45, a second frame top undercut 46, and a second frame clamping assembly groove 47, wherein:

[0201] The second frame left extension 41 is arranged on the left side of the second frame 4 and is in a horizontal state, used for guiding the second box shell 2;

[0202] The second frame inner lining zipper installation groove 42 is arranged on the left part of the middle part of the second frame 4, and its opening faces downward, used for accommodating the internal lining 7;

[0203] The second frame steel wire installation groove 43 is arranged on the middle part of the second frame 4, and its opening faces downward, used for accommodating the lining fixing steel wire 8, and further connecting the internal lining fixing part 9 wrapped around the periphery of the lining fixing steel wire 8 and the first frame 3;

[0204] The second frame right side support rib 44 is arranged below the right side of the second frame 4, used for supporting the first frame zipper 5 and the second frame zipper 6 together with the first frame 3;

[0205] The second frame zipper installation groove 45 is arranged on the right part of the middle part of the second frame 4, and its opening faces the right side, used for accommodating the inner side of the second frame zipper 6;

[0206] The second frame top undercut 46 is transversely arranged on the upper part of the second frame 4;

[0207] The second frame clamping assembly groove 47 is arranged on the upper part of the second frame 4, and its opening faces the left side, used for clamping the second box shell 2.

[0208] Further referring to Figure 9 and 10 , the first frame top undercut 36 includes a first frame top undercut outer side abutting part 361, a first frame top undercut inner side abutting part 362, and a first frame top undercut outward extension 363, when the first box shell 1 is buckled with the first frame 3:

[0209] The first frame top undercut outer side abutting part 361 abuts with the left end of the first box shell surface layer extension 13;

[0210] The first frame top inverted buckle inner side abutment part 362 abuts against the right end of the first box shell clamping strip 16;

[0211] The first frame top inverted buckle outer extending part 363 abuts against the left side of the first box shell inner connecting rib 15;

[0212] The second frame top inverted buckle part 46 comprises a second frame top inverted buckle outer side abutment part 461, a second frame top inverted buckle inner side abutment part 462 and a second frame top inverted buckle outer extending part 463, when the second box shell 2 is buckled with the second frame 4:

[0213] The second frame top inverted buckle outer side abutment part 461 abuts against the right end of the second box shell surface layer extending part 23;

[0214] The second frame top inverted buckle inner side abutment part 462 abuts against the left end of the second box shell clamping strip 26;

[0215] The second frame top inverted buckle outer extending part 463 abuts against the right side of the second box shell inner connecting rib 25.

[0216] Preferably, the first frame inner lining zipper installation slot 32, the first frame steel wire installation slot 33 and the first frame zipper installation slot 35 are located at the same horizontal position; and / or, the second frame inner lining zipper installation slot 42, the second frame steel wire installation slot 43 and the second frame zipper installation slot 45 are located at the same horizontal position.

[0217] Preferably, the transverse width of the first frame clamping fitting slot 37 and the transverse width of the first box shell clamping strip 16 are matched, for preventing the connection between the first box shell 1 and the first frame 3 from loosening; and / or, the transverse width of the second frame clamping fitting slot 47 and the transverse width of the second box shell clamping strip 26 are matched, for preventing the connection between the second box shell 2 and the second frame 4 from loosening.

[0218] The specific working principle of the third embodiment is as follows:

[0219] As Figure 11As shown, taking the first case 1 and the first frame 3 as an example, the first case 1 is inserted into the first frame 3 along the arrow direction to the left, and a little force is needed to insert the first case 1 into the first frame 3. The first case inner reinforcing part 12 and the first case clamping strip 16 first move along the right extension part 31 of the first frame to the first frame clamping assembly groove 37, the first frame top inverted part 36 is lifted up by the first case clamping strip 16, the first case inner reinforcing part 12 and the first case clamping strip 16 pass through the right entrance of the first frame clamping assembly groove 37 in sequence, the first frame top inverted part outer abutting part 361 abuts against the left end of the first case surface layer extension part 13, the first frame top inverted part inner abutting part 362 abuts against the right end of the first case clamping strip 16, and the first frame top inverted part outward extension part 363 abuts against the left side of the first case inner connecting rib 15, so that the first case 1 is clamped and fixed in the first frame clamping assembly groove 37 and cannot be taken out.

[0220] Similarly, the second case 2 is inserted into the second frame 4 along the arrow direction to the right, and a little force is needed to insert the second case 2 into the second frame 4. The second case inner reinforcing part 22 and the second case clamping strip 26 first move along the left extension part 41 of the second frame to the second frame clamping assembly groove 47, the second frame top inverted part 46 is lifted up by the second case clamping strip 26, the second case inner reinforcing part 22 and the second case clamping strip 26 pass through the left entrance of the second frame clamping assembly groove 47 in sequence, the second frame top inverted part outer abutting part 461 abuts against the right end of the second case surface layer extension part 23, the second frame top inverted part inner abutting part 462 abuts against the left end of the second case clamping strip 26, and the second frame top inverted part outward extension part 463 abuts against the right side of the second case inner connecting rib 25, so that the second case 2 is clamped and fixed in the second frame clamping assembly groove 47 and cannot be taken out.

[0221] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A quick assembly fixing structure of an injection molded travel case and a middle frame, characterized in that, The first box shell, the second box shell, the first frame, the second frame, the first frame zipper and the second frame zipper are included, wherein: The main body of the first frame is arranged at the mouth of the first box shell, the top of the first frame and the mouth of the first box shell are provided with reverse buckle structures, the reverse buckle structure of the top of the first frame and the reverse buckle structure of the mouth of the first box shell are engaged with each other, the first box shell comprises a first box shell body, a first box shell internal reinforcing part and a first box shell surface layer extension part, wherein: The first box shell internal reinforcing part is fixedly connected to the left end of the first box shell body; The first box shell surface layer extension part is located above the first box shell internal reinforcing part and extends obliquely leftward from the connection position between the first box shell internal reinforcing part and the first box shell body; The first box shell is fixedly connected to the first frame through the first box shell internal reinforcing part and the first box shell surface layer extension part; The main body of the second frame is arranged at the mouth of the second box shell, the top of the second frame and the mouth of the second box shell are provided with reverse buckle structures, the reverse buckle structure of the top of the second frame and the reverse buckle structure of the mouth of the second box shell are engaged with each other, the second box shell comprises a second box shell body, a second box shell internal reinforcing part and a second box shell surface layer extension part, wherein: The second box shell internal reinforcing part is fixedly connected to the right end of the second box shell body; The second box shell surface layer extension part is located above the second box shell internal reinforcing part and extends obliquely rightward from the connection position between the second box shell internal reinforcing part and the second box shell body; The second box shell is fixedly connected to the second frame through the second box shell internal reinforcing part and the second box shell surface layer extension part; The inner side of the first frame zipper is fixedly connected to the first frame, the inner side of the second frame zipper is fixedly connected to the second frame, and the outer side of the first frame zipper and the outer side of the second frame zipper are pulled together to form a closed box interior space.

2. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 1, characterized in that, The first box shell further comprises a first box shell end reverse buckle part and a first box shell internal connecting rib, wherein: The first box shell end reverse buckle part is fixedly connected to the left end of the first box shell surface layer extension part and extends rightward; The first box shell internal connecting rib is vertically connected between the first box shell internal reinforcing part and the first box shell surface layer extension part and forms a first box shell internal reinforcing cavity with the first box shell internal reinforcing part and the first box shell surface layer extension part, the first box shell internal reinforcing cavity is open leftward; The length of the first box shell internal reinforcing part is shorter than the length of the first box shell surface layer extension part; The second box shell further comprises a second box shell end reverse buckle part and a second box shell internal connecting rib, wherein: The second box shell end reverse buckle part is fixedly connected to the right end of the second box shell surface layer extension part and extends leftward; The second box shell internal connecting rib is vertically connected between the second box shell internal reinforcing part and the second box shell surface layer extension part and forms a second box shell internal reinforcing cavity with the second box shell internal reinforcing part and the second box shell surface layer extension part, the second box shell internal reinforcing cavity is open rightward; The length of the second box shell internal reinforcing part is shorter than the length of the second box shell surface layer extension part.

3. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 1, characterized in that, The first box shell further comprises a first box shell clamping strip, a first box shell fastener, and a first box shell internal connecting rib, wherein: The first box shell clamping strip is in an L-shaped structure, the vertical part of which is in abutment with the left end of the first box shell surface layer extension, and the horizontal part of which is in abutment with the outer surface of the first box shell surface layer extension, and the first box shell clamping strip and the first box shell surface layer extension are fixedly connected through the first box shell fastener; The right end of the first box shell clamping strip is upwardly inclined; The first box shell internal connecting rib is vertically connected between the first box shell internal reinforcing part and the first box shell surface layer extension, and forms a first box shell internal reinforcing cavity with an opening to the left together with the first box shell internal reinforcing part and the first box shell surface layer extension; The length of the first box shell internal reinforcing part is shorter than the length of the first box shell surface layer extension; The second box shell further comprises a second box shell clamping strip, a second box shell fastener, and a second box shell internal connecting rib, wherein: The second box shell clamping strip is in an L-shaped structure, the vertical part of which is in abutment with the right end of the second box shell surface layer extension, and the horizontal part of which is in abutment with the outer surface of the second box shell surface layer extension, and the second box shell clamping strip and the second box shell surface layer extension are fixedly connected through the second box shell fastener; The left end of the second box shell clamping strip is upwardly inclined; The second box shell internal connecting rib is vertically connected between the second box shell internal reinforcing part and the second box shell surface layer extension, and forms a second box shell internal reinforcing cavity with an opening to the right together with the second box shell internal reinforcing part and the second box shell surface layer extension; The length of the second box shell internal reinforcing part is shorter than the length of the second box shell surface layer extension.

4. The quick assembly fixing structure of the injection-molded travel case and the middle frame according to claim 2 or 3, characterized in that, The first frame comprises a first frame right side extension, a first frame internal lining zipper installation slot, a first frame steel wire installation slot, a first frame left side supporting rib, a first frame zipper installation slot, a first frame top reverse buckling part, a first frame clamping fitting slot, a first frame right side protruding rib, and a first frame internal reinforcing part groove, wherein: The first frame right side extension is arranged below the right side of the first frame and is in an inclined state with the left side being higher than the right side, so as to facilitate the introduction of the first box shell internal reinforcing part; The first frame internal lining zipper installation slot is arranged in the middle part of the first frame and has an opening facing downward, so as to accommodate an internal lining; The first frame steel wire installation slot is arranged below the middle part of the first frame and has an opening facing downward, so as to accommodate an internal lining fixing steel wire, and the internal lining fixing part surrounding the internal lining fixing steel wire is connected with the first frame; The first frame left side supporting rib is arranged below the left side of the first frame, so as to support the first frame zipper and the second frame zipper together with the second frame; The first frame zipper installation slot is arranged in the middle part of the first frame and has an opening facing the left side, so as to accommodate the inner side of the first frame zipper; The first frame top reverse buckling part is transversely arranged in the upper part of the first frame; The first frame clamping fitting slot is arranged in the upper part of the first frame and has an opening facing the right side, so as to clamp the mouth part of the first box shell; The first frame right side protruding rib is arranged below the right side of the first frame and above the first frame right side extension, and is used to extend into the first box shell internal reinforcing cavity when the first box shell is clamped into the first frame; The first frame internal reinforcing part groove is arranged on the right side of the first frame and is formed by the first frame right side protruding rib, the first frame and the first frame right side extension, and is used to fix the first box shell internal reinforcing part; The second frame includes a second frame left side extension, a second frame inner lining zipper installation slot, a second frame steel wire installation slot, a second frame right side support rib, a second frame zipper installation slot, a second frame top reverse buckle part, a second frame clamping assembly slot, a second frame left side protruding rib and a second frame internal reinforcing part groove, wherein: The second frame left side extension is arranged below the left side of the second frame and is in an inclined state with the left side being lower and the right side being higher, and is used to facilitate the introduction of the second box shell internal reinforcing part; The second frame inner lining zipper installation slot is arranged in the middle of the second frame and has an opening facing downward, and is used to accommodate the internal lining; The second frame steel wire installation slot is arranged below the middle of the second frame and has an opening facing downward, and is used to accommodate the lining fixing steel wire, so as to connect the internal lining fixing part wrapped around the periphery of the lining fixing steel wire and the second frame; The second frame right side support rib is arranged below the right side of the second frame, and is used to support the first frame zipper and the second frame zipper together with the first frame; The second frame zipper installation slot is arranged in the middle of the second frame and has an opening facing the right side, and is used to accommodate the inner side of the second frame zipper; The second frame top reverse buckle part is arranged horizontally on the upper part of the second frame; The second frame clamping assembly slot is arranged on the upper part of the second frame and has an opening facing the left side, and is used to clamp the mouth part of the second box shell; The second frame left side protruding rib is arranged below the left side of the second frame and above the second frame left side extension, and is used to extend into the second box shell internal reinforcing cavity when the second box shell is clamped into the second frame; The second frame internal reinforcing part groove is arranged on the left side of the second frame and is formed by the second frame left side protruding rib, the second frame and the second frame left side extension, and is used to fix the second box shell internal reinforcing part.

5. The quick assembly fixing structure of the injection-molded travel case and the middle frame according to claim 4, characterized in that, The transverse length of the first frame right side protruding rib is less than or equal to the transverse depth of the first box shell internal reinforcing cavity; and / or, the transverse length of the second frame left side protruding rib is less than or equal to the transverse depth of the second box shell internal reinforcing cavity.

6. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 1, characterized in that, The first box shell further includes a first box shell clamping strip, a first box shell fastener and a first box shell internal connecting rib, wherein: The first box shell clamping strip is in an L-shaped structure, the vertical part of which abuts against the left end of the first box shell internal reinforcing part, the horizontal part of which abuts against the upper surface of the first box shell internal reinforcing part, and the first box shell clamping strip and the first box shell internal reinforcing part are fixedly connected through the first box shell fastener; The right end of the first box shell clamping strip is inclined upward; The first box shell interior connecting rib is vertically connected between the first box shell interior reinforcing part and the first box shell surface layer extension part, and forms a first box shell interior reinforcing cavity with an opening to the left with the first box shell interior reinforcing part and the first box shell surface layer extension part; The length of the first box shell interior reinforcing part is longer than the length of the first box shell surface layer extension part; The second box shell further comprises a second box shell clamping strip, a second box shell fastener, and a second box shell interior connecting rib, wherein: The second box shell clamping strip is in an L-shaped structure, the vertical part of which is in abutment with the right end of the second box shell interior reinforcing part, and the horizontal part of which is in abutment with the upper surface of the second box shell interior reinforcing part, and the second box shell clamping strip and the second box shell interior reinforcing part are fixedly connected through the second box shell fastener; The left end of the second box shell clamping strip is inclined upward; The second box shell interior connecting rib is vertically connected between the second box shell interior reinforcing part and the second box shell surface layer extension part, and forms a second box shell interior reinforcing cavity with an opening to the right with the second box shell interior reinforcing part and the second box shell surface layer extension part; The length of the second box shell interior reinforcing part is longer than the length of the second box shell surface layer extension part.

7. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 6, characterized in that, The first frame comprises a first frame right side extension part, a first frame inner lining zipper installation slot, a first frame steel wire installation slot, a first frame left side support rib, a first frame zipper installation slot, a first frame top reverse buckle part, and a first frame clamping assembly slot, wherein: The first frame right side extension part is arranged on the right side of the first frame in a horizontal state, and is used for guiding the first box shell; The first frame inner lining zipper installation slot is arranged on the right side of the middle part of the first frame, and has an opening facing downward, and is used for accommodating the internal lining; The first frame steel wire installation slot is arranged on the middle part of the first frame, and has an opening facing downward, and is used for accommodating the lining fixing steel wire, so that the internal lining fixing part wrapped around the periphery of the lining fixing steel wire is connected with the first frame; The first frame left side support rib is arranged below the left side of the first frame, and is used for supporting the first frame zipper and the second frame zipper together with the second frame; The first frame zipper installation slot is arranged on the left side of the middle part of the first frame, and has an opening facing the left side, and is used for accommodating the inner side of the first frame zipper; The first frame top reverse buckle part is arranged on the upper part of the first frame in a transverse direction; The first frame clamping assembly slot is arranged on the upper part of the first frame, and has an opening facing the right side, and is used for clamping the first box shell; The second frame comprises a second frame left side extension part, a second frame inner lining zipper installation slot, a second frame steel wire installation slot, a second frame right side support rib, a second frame zipper installation slot, a second frame top reverse buckle part, and a second frame clamping assembly slot, wherein: The second frame left side extension part is arranged on the left side of the second frame in a horizontal state, and is used for guiding the second box shell; The second frame inner lining zipper installation slot is arranged on the left side of the middle part of the second frame, and has an opening facing downward, and is used for accommodating the internal lining; The second frame steel wire installation groove is arranged in the middle of the second frame, and its opening faces downward, used for accommodating the inner lining fixing steel wire, and then connecting the internal lining fixing part wrapped outside the inner lining fixing steel wire and the first frame; The second frame right side supporting rib is arranged below the right side of the second frame, used for supporting the first frame zipper and the second frame zipper together with the first frame; The second frame zipper installation groove is arranged in the middle of the second frame, and its opening faces the right side, used for accommodating the inner side of the second frame zipper; The second frame top reverse buckle part is arranged horizontally in the upper part of the second frame; The second frame clamping assembly groove is arranged in the upper part of the second frame, and its opening faces the left side, used for clamping the second box shell.

8. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 7, characterized in that, The first frame top reverse buckle part includes a first frame top reverse buckle part outer side abutting part, a first frame top reverse buckle part inner side abutting part, and a first frame top reverse buckle part outward extending part, when the first box shell is buckled with the first frame: The first frame top reverse buckle part outer side abutting part abuts with the left end of the first box shell surface layer extending part; The first frame top reverse buckle part inner side abutting part abuts with the right end of the first box shell clamping strip; The first frame top reverse buckle part outward extending part abuts with the left side of the first box shell internal connecting rib; The second frame top reverse buckle part includes a second frame top reverse buckle part outer side abutting part, a second frame top reverse buckle part inner side abutting part, and a second frame top reverse buckle part outward extending part, when the second box shell is buckled with the second frame: The second frame top reverse buckle part outer side abutting part abuts with the right end of the second box shell surface layer extending part; The second frame top reverse buckle part inner side abutting part abuts with the left end of the second box shell clamping strip; The second frame top reverse buckle part outward extending part abuts with the right side of the second box shell internal connecting rib.

9. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 7, characterized in that, The first frame lining zipper installation groove, the first frame steel wire installation groove, and the first frame zipper installation groove are located in the same horizontal position; and / or, The second frame lining zipper installation groove, the second frame steel wire installation groove, and the second frame zipper installation groove are located in the same horizontal position.

10. The quick assembly fixing structure of an injection-molded travel case and a middle frame according to claim 7, characterized in that, The transverse width of the first frame clamping assembly groove and the transverse width of the first box shell clamping strip are matched, used for preventing the connection between the first box shell and the first frame from loosening; and / or, The transverse width of the second frame clamping assembly groove and the transverse width of the second box shell clamping strip are matched, used for preventing the connection between the second box shell and the second frame from loosening.

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