Glue-free fixed middle frame and quick assembly structure of injection molding travel suitcase

Abstract

The invention discloses an injection molding travel suitcase glue-free fixed middle frame and rapid assembly structure, 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 opening parts of the first frame and the first case shell are both provided with an inverted buckle structure; the first frame is clamped and fixed with the inverted buckle structure of the opening part of the first box shell, and the inverted buckle structure of the first frame is engaged with the inverted buckle structure of the opening part of the first box shell; a main body of the second frame is arranged at the opening part of the second box shell, the second frame and the opening part of the second box shell are both provided with inverted buckle structures, the second frame and the inverted buckle structure of the opening part of the second box shell are clamped and fixed, and the inverted buckle structure of the second frame and the inverted buckle structure of the opening part of the second box shell are engaged with each other; 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 present invention relates to the technical field of suitcases, and particularly relates to a glue-free fixing middle frame and a rapid assembly structure for an injection-molded suitcase. Background Art

[0002] In currently commonly used suitcases, generally, a set of frames with concave-convex fitting are provided at the opening edges of the case shells on the front and back sides. The purpose is, on the one hand, to increase the service strength of the suitcase, and on the other hand, to improve the closing and buckling matching degree and tightness of the two side case shells, facilitating user use.

[0003] The prior art uses rivet riveting for fixation. The bent and formed frame is fixed to the opening of the case shell by rivets. The fixing method principle is simple and is currently the most widely used in the industry. However, in actual production and use, it is prone to inconvenient operation and low production efficiency. At the same time, when using rivets for riveting, through holes for rivets are required, and multiple through-hole fixing points must be set, resulting in more binding steps and more cumbersome preprocessing procedures. And when there are overlapping holes at the splicing and overlapping positions, misalignment often occurs and requires manual correction, with low operability. At the same time, the riveting of rivets requires the operator to hold the case body and lift it onto the riveting machine. When the case body is large in size, the production operation convenience is very low, and the worker is extremely prone to fatigue, affecting production efficiency and production safety. Because the number of rivets is large, the low production efficiency further increases the production cost of the product.

[0004] The structural strength between two rivets is weak and gaps are prone to appear. Even if the rivets are arranged densely in the rivet fixing structure, there will always be a certain distance between adjacent rivets. This distance is not completely fixed, with low structural strength and the overall fixing strength not being ideal. When local collision deformation occurs, it is extremely easy for the frame and the case shell to separate and gaps to appear, thereby affecting the appearance and bringing a bad product experience to the user.

[0005] A large number of exposed rivets affect the aesthetic appearance of the suitcase. When using rivets for fixation, the rivets will be exposed outside the frame and the number is large, thus affecting the overall aesthetics of the suitcase. Summary of the Invention

[0006] In order to overcome the deficiencies in the prior art, the present invention provides a glue-free fixing middle frame and a rapid assembly structure for an injection-molded suitcase. The use of this structure can effectively increase the assembly efficiency between the frame and the case shell, improve the stable connection between the frame and the case shell, and at the same time improve the overall aesthetics of the luggage.

[0007] In order to achieve the above invention purpose, the technical solution adopted to solve its technical problems is as follows:

[0008] A glue-free middle frame fixing and quick assembly structure for an injection-molded suitcase, comprising a first case shell, a second case shell, a first frame, a second frame, a first frame zipper, and a second frame zipper, wherein:

[0009] The main body of the first frame is arranged at the mouth of the first box shell. The first frame and the mouth of the first box shell are both provided with an inverted structure. The first frame is fixedly connected to the inverted structure of the mouth of the first box shell. The inverted structure of the first frame and the inverted structure of the mouth of the first box shell are engaged with each other.

[0010] The first housing includes a first housing body, a first housing internal reinforcement portion, and a first housing surface extension portion, wherein:

[0011] The first box shell internal reinforcement portion is fixedly connected to the left end of the first box shell body;

[0012] The first shell surface extension portion is located above the first shell internal reinforcement portion and extends obliquely to the left from the connection between the first shell internal reinforcement portion and the first shell body;

[0013] The first box shell is fixed to the first frame by means of the first box shell internal reinforcement portion and the first box shell surface extension portion;

[0014] The first frame includes a first frame right side extension portion, which is provided on the right side of the first frame and is in a state of being higher on the left and lower on the right or in a horizontal state, and is used to introduce the first box shell;

[0015] The main body of the second frame is arranged at the mouth of the second box shell. The second frame and the mouth of the second box shell are both provided with an inverted structure. The second frame is fixedly connected to the inverted structure of the second box shell mouth. The inverted structure of the second frame and the inverted structure of the second box shell mouth engage with each other.

[0016] The second housing includes a second housing body, a second housing internal reinforcement portion, and a second housing surface extension portion, wherein:

[0017] The inner reinforcement portion of the second housing is fixedly connected to the right end of the second housing body;

[0018] The second shell surface extension portion is located above the second shell internal reinforcement portion and extends obliquely to the right from the connection between the second shell internal reinforcement portion and the second shell body;

[0019] The second box shell is fixed to the second frame by means of the second box shell internal reinforcement portion and the second box shell surface extension portion;

[0020] The second frame includes a second frame left side extension portion, which is provided on the left side of the second frame and is in a state of being higher on the right and lower on the left or in a horizontal state, and is used to introduce the second box shell;

[0021] The inner side of the first frame zipper is snap-fitted to the first frame, the inner side of the second frame zipper is snap-fitted to the second frame, and the outer sides of the first frame zipper and the second frame zipper are zipped together to form a closed interior space of the box.

[0022] Preferably, the first frame zipper is embedded in the left middle portion of the first frame; and the second frame zipper is embedded in the right middle portion of the second frame.

[0023] Furthermore, the first housing further comprises an undercut portion at the end of the first housing and internal connecting ribs of the first housing, wherein:

[0024] The undercut portion at the end of the first shell is fixedly connected to the left end of the surface extension portion of the first shell and extends partially to the right;

[0025] The first shell internal connection rib is vertically connected between the first shell internal reinforcement portion and the first shell surface extension portion, and encloses the first shell internal reinforcement portion and the first shell surface extension portion to form a first shell internal reinforcement cavity opening to the left;

[0026] The length of the first shell internal reinforcement portion is shorter than the length of the first shell surface extension portion;

[0027] The second housing further comprises an undercut portion at the end of the second housing and internal connecting ribs of the second housing, wherein:

[0028] The undercut portion at the end of the second shell is fixedly connected to the right end of the surface extension portion of the second shell and extends partially to the left;

[0029] The second shell internal connecting rib is vertically connected between the second shell internal reinforcement portion and the second shell surface extension portion, and encloses the second shell internal reinforcement portion and the second shell surface extension portion to form a second shell internal reinforcement cavity opening to the right;

[0030] The length of the inner reinforcement portion of the second shell is shorter than the length of the surface extension portion of the second shell.

[0031] Furthermore, the first box shell further comprises a first box shell clip, a first box shell fastener, and a first box shell internal connecting rib, wherein:

[0032] The first casing clamping strip has an L-shaped structure. Its vertical part abuts against the left end of the extension part of the first casing surface layer, and its horizontal part abuts against the outer surface of the extension part of the first casing surface layer. The first casing clamping strip and the extension part of the first casing surface layer are fixedly connected through the first casing fastener;

[0033] The right end of the first casing clamping strip slopes upward;

[0034] The internal connecting rib of the first casing is vertically connected between the internal reinforcing part of the first casing and the extension part of the first casing surface layer, and encloses a first internal reinforcing cavity of the first casing with an opening to the left with the internal reinforcing part of the first casing and the extension part of the first casing surface layer;

[0035] The length of the internal reinforcing part of the first casing is shorter than the length of the extension part of the first casing surface layer;

[0036] The second casing further includes a second casing clamping strip, a second casing fastener, and a second casing internal connecting rib, where:

[0037] The second casing clamping strip has an L-shaped structure. Its vertical part abuts against the right end of the extension part of the second casing surface layer, and its horizontal part abuts against the outer surface of the extension part of the second casing surface layer. The second casing clamping strip and the extension part of the second casing surface layer are fixedly connected through the second casing fastener;

[0038] The left end of the second casing clamping strip slopes upward;

[0039] The internal connecting rib of the second casing is vertically connected between the internal reinforcing part of the second casing and the extension part of the second casing surface layer, and encloses a second internal reinforcing cavity of the second casing with an opening to the right with the internal reinforcing part of the second casing and the extension part of the second casing surface layer;

[0040] The length of the internal reinforcing part of the second casing is shorter than the length of the extension part of the second casing surface layer.

[0041] Further, the first frame further includes a first frame inner lining zipper installation groove, a first frame inner lining steel wire installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking part, a first frame clamping and assembling groove, a first frame right side convex rib, and a first frame internal reinforcing part groove, where:

[0042] The first frame inner lining zipper installation groove is arranged in the middle of the first frame, and its opening faces downward for accommodating the internal lining;

[0043] The first frame inner lining wire installation groove is provided below the middle of the first frame, and its opening faces downward, for accommodating the inner lining fixing wire, and then is connected to the first frame through the inner lining fixing part wrapped around the periphery of the inner lining fixing wire;

[0044] The first frame left support rib is provided below the left side of the first frame, for jointly supporting the first frame zipper and the second frame zipper with the second frame;

[0045] The first frame zipper installation groove is provided in the middle of the first frame, and its opening faces left, for accommodating the inner side of the first frame zipper;

[0046] The first frame top docking part is horizontally provided at the upper part of the first frame;

[0047] The first frame clamping and assembling groove is provided at the upper part of the first frame, and its opening faces right, for clamping the mouth part of the first box shell;

[0048] The first frame right convex rib is provided below the right side of the first frame and above the first frame right extension part, for extending into the inner reinforcement cavity of the first box shell when the first box shell is inserted into the first frame;

[0049] The first frame inner reinforcement part groove is provided on the right side of the first frame, formed by enclosing the first frame right convex rib, the first frame and the first frame right extension part, for fixing the first box shell inner reinforcement part;

[0050] The second frame further includes a second frame inner lining zipper installation groove, a second frame wire installation groove, a second frame right support rib, a second frame zipper installation groove, a second frame top docking part, a second frame clamping and assembling groove, a second frame left convex rib, a second frame inner reinforcement part groove, wherein:

[0051] The second frame inner lining zipper installation groove is provided in the middle of the second frame, and its opening faces downward, for accommodating the inner lining;

[0052] The second frame wire installation groove is provided below the middle of the second frame, and its opening faces downward, for accommodating the inner lining fixing wire, and then is connected to the second frame through the inner lining fixing part wrapped around the periphery of the inner lining fixing wire;

[0053] The second frame right support rib is provided below the right side of the second frame, for jointly supporting the first frame zipper and the second frame zipper with the first frame;

[0054] The second frame zipper installation groove is provided in the middle of the second frame, and its opening faces to the right, for accommodating the inner side of the second frame zipper;

[0055] The top docking part of the second frame is horizontally provided in the upper part of the second frame;

[0056] The second frame clamping and assembling groove is provided in the upper part of the second frame, and its opening faces to the left, for clamping the mouth part of the second box shell;

[0057] The left rib of the second frame is provided below the left side of the second frame and above the left extension part of the second frame, for extending into the internal reinforcement cavity of the second box shell when the second box shell is inserted into the second frame;

[0058] The internal reinforcement part groove of the second frame is provided on the left side of the second frame, formed by enclosing the left rib of the second frame, the second frame and the left extension part of the second frame, for fixing the internal reinforcement part of the second box shell.

[0059] Furthermore, 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, where:

[0060] The first box shell clamping strip is in an L-shaped structure, its vertical part abuts against the left end of the internal reinforcement part of the first box shell, its horizontal part abuts against the upper surface of the internal reinforcement part of the first box shell, and the first box shell clamping strip and the internal reinforcement part of the first box shell are fixedly connected through the first box shell fastener;

[0061] The right end of the first box shell clamping strip inclines upward;

[0062] The first box shell internal connecting rib is vertically connected between the internal reinforcement part of the first box shell and the surface layer extension part of the first box shell, and encloses with the internal reinforcement part of the first box shell and the surface layer extension part of the first box shell to form a first box shell internal reinforcement cavity with an opening to the left;

[0063] The length of the internal reinforcement part of the first box shell is longer than the length of the surface layer extension part of the first box shell;

[0064] The second box shell further includes a second box shell clamping strip, a second box shell fastener, and a second box shell internal connecting rib, where:

[0065] The second box shell clamping strip is in an L-shaped structure, its vertical part abuts against the right end of the internal reinforcement part of the second box shell, its horizontal part abuts against the upper surface of the internal reinforcement part of the second box shell, and the second box shell clamping strip and the internal reinforcement part of the second box shell are fixedly connected through the second box shell fastener;

[0066] The left end of the second box shell clamping strip inclines upward;

[0067] The vertical connecting ribs inside the second housing are vertically connected between the internal reinforcing part and the surface layer extension part of the second housing, and enclose a second internal reinforcing cavity of the second housing with an opening to the right together with the internal reinforcing part and the surface layer extension part of the second housing;

[0068] The length of the internal reinforcing part of the second housing is longer than the length of the surface layer extension part of the second housing.

[0069] Further, the first frame further includes a first frame inner lining zipper installation groove, a first frame inner lining steel wire installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking part, and a first frame clamping and assembling groove, wherein:

[0070] The first frame inner lining zipper installation groove is arranged at a position slightly to the right of the middle of the first frame, and its opening faces downward, for accommodating the internal lining;

[0071] The first frame inner lining steel wire installation groove is arranged in the middle of the first frame, and its opening faces downward, for accommodating the inner lining fixing steel wire, and then is connected to the first frame through the inner lining fixing part wrapped around the periphery of the inner lining fixing steel wire;

[0072] The first frame left side support rib is arranged at the lower left side of the first frame, for jointly supporting the first frame zipper and the second frame zipper with the second frame;

[0073] The first frame zipper installation groove is arranged at a position slightly to the left of the middle of the first frame, and its opening faces left, for accommodating the inner side of the first frame zipper;

[0074] The first frame top docking part is horizontally arranged at the upper part of the first frame;

[0075] The first frame clamping and assembling groove is arranged at the upper part of the first frame, and its opening faces right, for clamping the first housing;

[0076] The second frame further includes a second frame inner lining zipper installation groove, a second frame steel wire installation groove, a second frame right side support rib, a second frame zipper installation groove, a second frame top docking part, and a second frame clamping and assembling groove, wherein:

[0077] The second frame inner lining zipper installation groove is arranged at a position slightly to the left of the middle of the second frame, and its opening faces downward, for accommodating the internal lining;

[0078] The second frame wire installation groove is arranged in the middle of the second frame, and its opening faces downward, for accommodating the inner lining fixing wire, and then connecting with the first frame through the inner lining fixing part wrapped around the periphery of the inner lining fixing wire;

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

[0080] The second frame zipper installation groove is arranged at a position slightly to the right of the middle of the second frame, and its opening faces to the right, for accommodating the inner side of the second frame zipper;

[0081] The top docking part of the second frame is horizontally arranged at the upper part of the second frame;

[0082] The second frame clamping and assembling groove is arranged at the upper part of the second frame, and its opening faces to the left, for clamping the second box shell.

[0083] Further, the top docking part of the first frame includes an outer abutting part of the top docking part of the first frame, an inner abutting part of the top docking part of the first frame, and an outward extending part of the top docking part of the first frame. When the first box shell is buckled with the first frame:

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

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

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

[0087] The top docking part of the second frame includes an outer abutting part of the top docking part of the second frame, an inner abutting part of the top docking part of the second frame, and an outward extending part of the top docking part of the second frame. When the second box shell is buckled with the second frame:

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

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

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

[0091] Preferably, the first frame zipper is arranged at the top of the first frame; the second frame zipper is arranged at the top of the second frame.

[0092] Furthermore, the first housing further comprises a first housing clip and a first housing fastener, wherein:

[0093] The first box shell clip is an L-shaped structure, with its vertical portion abutting against the left end of the first box shell internal reinforcement portion, and its horizontal portion abutting against the lower surface of the first box shell internal reinforcement portion, and the first box shell clip and the first box shell internal reinforcement portion are fixedly connected by the first box shell fastener;

[0094] The right end of the horizontal portion of the first housing clip is tilted downward;

[0095] The length of the internal reinforcement portion of the first shell is longer than the length of the surface extension portion of the first shell;

[0096] The second housing further comprises a second housing clip and a second housing fastener, wherein:

[0097] The second box shell clip is an L-shaped structure, the vertical portion of which abuts against the right end of the second box shell internal reinforcement portion, and the horizontal portion abuts against the lower surface of the second box shell internal reinforcement portion, and the second box shell clip is fixedly connected to the second box shell internal reinforcement portion by the second box shell fastener;

[0098] The left end of the horizontal portion of the second housing clip is tilted downward;

[0099] The length of the inner reinforcement portion of the second shell is longer than the length of the surface extension portion of the second shell.

[0100] Furthermore, the first box shell further includes a first box shell clamping portion, which is located below the left side of the inner reinforcement portion of the first box shell and gradually tilts downward from left to right;

[0101] The length of the internal reinforcement portion of the first shell is longer than the length of the surface extension portion of the first shell;

[0102] The second box shell further includes a second box shell clamping portion, which is located below the right side of the inner reinforcement portion of the second box shell and gradually tilts downward from right to left;

[0103] The length of the inner reinforcement portion of the second shell is longer than the length of the surface extension portion of the second shell.

[0104] Furthermore, the first frame further includes a first frame inner lining steel wire installation groove, a first frame inner lining zipper installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking portion, a first frame snap-fit assembly groove, and a first frame undercut portion, wherein:

[0105] The first frame lining zipper installation slot is located at the middle right position of the first frame, and its opening faces downwards, for accommodating the inner lining;

[0106] The first frame lining steel wire installation groove is provided in the middle of the first frame, and its opening faces downward, and is used to accommodate the lining fixing steel wire, and is then connected to the first frame through the inner lining fixing portion wrapped around the outer periphery of the lining fixing steel wire;

[0107] The left side support rib of the first frame is provided on the left side of the first frame, and is used to jointly support the first frame zipper and the second frame zipper together with the second frame, and to make the opposing surfaces of the first frame and the second frame abut against each other when the first frame zipper and the second frame zipper are in a closed state;

[0108] The first frame zipper installation groove is provided at the top of the first frame, and its opening faces left, for accommodating the inner side of the first frame zipper;

[0109] The top docking portion of the first frame is laterally arranged at the top of the first frame and is located on the right side of the zipper mounting groove of the first frame;

[0110] The first frame snap-fitting assembly groove is provided in the middle of the first frame, with its opening facing right, for snap-fitting the first box shell;

[0111] The first frame undercut portion is vertically arranged at the right opening of the first frame clamping assembly groove, and is used for clamping the first box shell;

[0112] The second frame further includes a second frame steel wire installation groove, a second frame lining zipper installation groove, a second frame right side support rib, a second frame zipper installation groove, a second frame top docking portion, a second frame snap-fit assembly groove, and a second frame undercut portion, wherein:

[0113] The second frame lining zipper installation slot is located at the left side of the middle portion of the second frame, and its opening faces downwards, for accommodating the inner lining;

[0114] The second frame steel wire installation groove is provided in the middle of the second frame, and its opening faces downward, and is used to accommodate the liner fixing steel wire, and is then connected to the second frame through the inner liner fixing portion wrapped around the outer periphery of the liner fixing steel wire;

[0115] The second frame right side support rib is provided on the right side of the second frame, and is used to jointly support the first frame zipper and the second frame zipper together with the first frame, and to make the opposing surfaces of the first frame and the second frame abut against each other when the first frame zipper and the second frame zipper are in a closed state;

[0116] The second frame zipper mounting groove is provided at the top of the second frame, and its opening faces right side, for accommodating the inner side of the second frame zipper;

[0117] The second frame top docking portion is laterally arranged at the top of the second frame and is located on the left side of the zipper mounting groove of the second frame;

[0118] The second frame snap-fitting groove is provided in the middle of the second frame, with its opening facing the left side, for snap-fitting the second box shell;

[0119] The second frame undercut portion is vertically arranged at the left opening of the second frame clamping assembly groove, and is used for clamping the second box shell.

[0120] Furthermore, the first frame top docking portion includes an outer abutting portion of the first frame top docking portion and an outward extending portion of the first frame top docking portion. When the first box shell is buckled with the first frame:

[0121] The right end of the outer abutting portion of the top docking portion of the first frame abuts against the left end of the surface extension portion of the first box shell;

[0122] The upper surface of the outwardly extending portion of the top docking portion of the first frame abuts against the lower surface of the surface extending portion of the first box shell;

[0123] The second frame top docking portion includes an outer abutting portion of the second frame top docking portion and an outward extending portion of the second frame top docking portion. When the second box shell is buckled with the second frame:

[0124] The left end of the outer abutting portion of the second frame top abutting portion abuts against the right end of the second shell surface extension portion;

[0125] The upper surface of the outwardly extending portion of the second frame top docking portion abuts against the lower surface of the second box shell surface extending portion.

[0126] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0127] 1. The present invention provides an injection-molded suitcase with a glue-free middle frame and a quick assembly structure. After installation, the frame and the case shell are tightly fitted together, effectively ensuring the connection stability between the frame and the case shell. Rivets or other methods are no longer needed for connection, thereby improving the overall aesthetics and assembly efficiency of the suitcase.

[0128] 2. In the injection-molded travel case of the present invention, the middle frame is fixed without glue and the quick assembly structure is such that the lateral width of the frame engaging assembly groove is adapted to the lateral width of the case shell buckle (clip strip), which is used to prevent the connection between the case shell and the frame from loosening, thereby enhancing the engaging strength between the frame and the case shell and reducing the risk of detachment between the frame and the case shell.

[0129] 3. In the injection-molded travel case of the present invention, the middle frame is fixed without glue and the quick assembly structure has reasonable structure, ingenious design, convenient operation, high production efficiency, strong stability and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0130] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0131] Figure 1 is a three-dimensional schematic diagram of the injection-molded travel case of the present invention with a middle frame fixed without glue and a quick assembly structure;

[0132] Figure 2 is a side schematic diagram of the injection-molded travel case of the present invention with a middle frame fixed without glue and a quick assembly structure;

[0133] Figure 3 is an overall structure schematic diagram of Embodiment 1 of the present invention;

[0134] Figure 4 is an overall structure decomposition schematic diagram of Embodiment 1 of the present invention;

[0135] Figure 5 is an assembly process schematic diagram of the first case shell and the first frame in Embodiment 1 of the present invention;

[0136] Figure 6 is an overall structure schematic diagram of Embodiment 2 of the present invention;

[0137] Figure 7 is an overall structure decomposition schematic diagram of Embodiment 2 of the present invention;

[0138] Figure 8 is an assembly process schematic diagram of the first case shell and the first frame in Embodiment 2 of the present invention;

[0139] Figure 9 is an overall structure schematic diagram of Embodiment 3 of the present invention;

[0140] Figure 10 is an overall structure decomposition schematic diagram of Embodiment 3 of the present invention;

[0141] Figure 11 It is a schematic diagram of the assembly process of the first box shell and the first frame in the third embodiment of the present invention;

[0142] Figure 12 It is a schematic diagram of the overall structure of the fourth embodiment of the present invention;

[0143] Figure 13 It is a schematic diagram of the overall structure decomposition of the fourth embodiment of the present invention;

[0144] Figure 14 It is a schematic diagram of the assembly process of the first box shell and the first frame in the fourth embodiment of the present invention;

[0145] Figure 15 It is a schematic diagram of the overall structure of the fifth embodiment of the present invention;

[0146] Figure 16 It is a schematic diagram of the overall structure decomposition of the fifth embodiment of the present invention;

[0147] Figure 17 It is a schematic diagram of the assembly process of the first box shell and the first frame in the fifth embodiment of the present invention.

[0148]

Main Symbol Explanation

[0149] 1 - First box shell; 11 - First box shell body; 12 - First box shell internal reinforcement part; 13 - First box shell surface layer extension part; 14 - First box shell end reverse buckle part; 15 - First box shell internal connecting rib; 16 - First box shell card strip; 17 - First box shell fastener; 18 - First box shell clamping part;

[0150] 2 - Second box shell; 21 - Second box shell body; 22 - Second box shell internal reinforcement part; 23 - Second box shell surface layer extension part; 24 - Second box shell end reverse buckle part; 25 - Second box shell internal connecting rib; 26 - Second box shell card strip; 27 - Second box shell fastener; 28 - Second box shell clamping part;

[0151] 3 - First frame; 31 - First frame right - hand side extension part; 32 - First frame inner lining zipper installation groove; 33 - First frame inner lining steel wire installation groove; 34 - First frame left - hand side support rib; 35 - First frame zipper installation groove; 36 - First frame top docking part; 361 - First frame top docking part outer abutting part; 362 - First frame top docking part inner abutting part; 363 - First frame top docking part outward extension part; 37 - First frame clamping and assembling groove; 38 - First frame right - hand side convex rib; 39 - First frame internal reinforcement part groove; 310 - First frame reverse buckle part;

[0152] 4-Second frame; 41-Second frame left extension; 42-Second frame lining zipper mounting slot; 43-Second frame steel wire mounting slot; 44-Second frame right support rib; 45-Second frame zipper mounting slot; 46-Second frame top docking portion; 461-Second frame top docking portion outer abutment portion; 462-Second frame top docking portion inner abutment portion; 463-Second frame top docking portion outward extension; 47-Second frame snap-fit assembly slot; 48-Second frame left convex rib; 49-Second frame internal reinforcement portion groove; 410-Second frame undercut portion;

[0153] 5-First frame zipper;

[0154] 6-Second frame zipper;

[0155] 7-Inner lining;

[0156] 8- Lining fixing steel wire;

[0157] 9-Internal lining fixing part. DETAILED DESCRIPTION

[0158] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0159] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0160] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0161] like Figure 1-17As shown, this embodiment discloses an injection-molded suitcase with a glue-free middle frame fixing and quick assembly structure, including a first box shell 1, a second box shell 2, a first frame 3, a second frame 4, a first frame zipper 5, and a second frame zipper 6, wherein:

[0162] The main body of the first frame 3 is arranged at the mouth of the first box shell 1. The first frame 3 and the mouth of the first box shell 1 are both provided with an inverted structure. The first frame 3 is fixedly connected to the inverted structure of the mouth of the first box shell 1 by snapping. The inverted structure of the first frame 3 and the inverted structure of the mouth of the first box shell 1 are engaged with each other.

[0163] The first housing 1 includes a first housing body 11, a first housing internal reinforcement portion 12, and a first housing surface extension portion 13, wherein:

[0164] The first box shell internal reinforcement portion 12 is fixedly connected to the left end of the first box shell body 11;

[0165] The first shell surface extension portion 13 is located above the first shell internal reinforcement portion 12 and extends obliquely to the left from the connection between the first shell internal reinforcement portion 12 and the first shell body 11;

[0166] The first housing 1 is fixed to the first frame 3 by means of the first housing internal reinforcement portion 12 and the first housing surface extension portion 13;

[0167] The first frame 3 includes a first frame right side extension 31, which is provided on the right side of the first frame 3 and is in a state of being higher on the left and lower on the right or in a horizontal state, and is used to introduce the first box shell 1;

[0168] Preferably, the first box shell body 11, the first box shell internal reinforcement portion 12, and the first box shell surface extension portion 13 are integrally formed or stamped, which effectively increases the service life of the first box shell 1.

[0169] The main body of the second frame 4 is arranged at the mouth of the second box shell 2. The second frame 4 and the mouth of the second box shell 2 are both provided with an inverted structure. The second frame 4 is fixedly connected to the inverted structure of the mouth of the second box shell 2 by snapping. The inverted structure of the second frame 4 and the inverted structure of the mouth of the second box shell 2 are engaged with each other.

[0170] The second housing 2 includes a second housing body 21, a second housing internal reinforcement portion 22, and a second housing surface extension portion 23, wherein:

[0171] The second box shell internal reinforcement portion 22 is fixedly connected to the right end of the second box shell body 21;

[0172] The second shell surface extension portion 23 is located above the second shell internal reinforcement portion 22 and extends obliquely to the right from the connection between the second shell internal reinforcement portion 22 and the second shell body 21;

[0173] The second housing 2 is fixed to the second frame 4 by means of the second housing internal reinforcement portion 22 and the second housing surface extension portion 23;

[0174] The second frame 4 includes a second frame left side extension 41, which is provided on the left side of the second frame 4 and is in a state where the right side is higher than the left side or in a horizontal state, and is used to introduce the second box shell 2;

[0175] Preferably, the second box shell body 21, the second box shell internal reinforcement portion 22, and the second box shell surface extension portion 23 are integrally formed or stamped, which effectively increases the service life of the second box shell 2.

[0176] The inner side of the first frame zipper 5 is engaged with the first frame 3 , the inner side of the second frame zipper 6 is engaged 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 internal space of the box.

[0177] refer to Figure 3-11 The first frame zipper 5 is embedded in the middle left side of the first frame 3; the second frame zipper 6 is embedded in the middle right side of the second frame 4.

[0178] Example 1

[0179] refer to Figure 3-5 The first box shell 1 further includes a first box shell end undercut portion 14 and a first box shell internal connecting rib 15, wherein:

[0180] The first shell end undercut portion 14 is fixedly connected to the left end of the first shell surface extension portion 13 and partially extends to the right;

[0181] The first shell internal connection rib 15 is vertically connected between the first shell internal reinforcement portion 12 and the first shell surface extension portion 13, and encloses the first shell internal reinforcement portion 12 and the first shell surface extension portion 13 to form a first shell internal reinforcement cavity opening to the left;

[0182] The length of the first shell internal reinforcement portion 12 is shorter than the length of the first shell surface extension portion 13;

[0183] The second housing 2 further includes an undercut portion 24 at the end of the second housing and a second housing internal connecting rib 25, wherein:

[0184] The second housing end snap-in portion 24 is fixedly connected to the right end of the second housing surface extension portion 23 and extends leftward;

[0185] The second housing internal connecting rib 25 is vertically connected between the second housing internal reinforcement portion 22 and the second housing surface extension portion 23, and encloses a second housing internal reinforcement cavity with an opening to the right with the second housing internal reinforcement portion 22 and the second housing surface extension portion 23;

[0186] The length of the second housing internal reinforcement portion 22 is shorter than the length of the second housing surface extension portion 23.

[0187] In this embodiment, the first housing body 11, the first housing internal reinforcement portion 12, the first housing surface extension portion 13, and the first housing end snap-in portion 14 are integrally formed or stamped, and / or, the second housing body 21, the second housing internal reinforcement portion 22, the second housing surface extension portion 23, and the second housing end snap-in portion 24 are integrally formed or stamped, effectively increasing the service life of the first housing 1 and / or the second housing 2.

[0188] Embodiment 2

[0189] Reference Figure 6-8 The first housing 1 further includes a first housing clamping strip 16, a first housing fastener 17, and a first housing internal connecting rib 15, where:

[0190] The first housing clamping strip 16 has an L-shaped structure, its vertical portion abuts against the left end of the first housing surface extension portion 13, its horizontal portion abuts against the outer surface of the first housing surface extension portion 13, and the first housing clamping strip 16 and the first housing surface extension portion 13 are fixedly connected by the first housing fastener 17;

[0191] The right end of the first housing clamping strip 16 slopes upward;

[0192] The first housing internal connecting rib 15 is vertically connected between the first housing internal reinforcement portion 12 and the first housing surface extension portion 13, and encloses a first housing internal reinforcement cavity with an opening to the left with the first housing internal reinforcement portion 12 and the first housing surface extension portion 13;

[0193] The length of the first housing internal reinforcement portion 12 is shorter than the length of the first housing surface extension portion 13;

[0194] The second housing 2 further includes a second housing clamping strip 26, a second housing fastener 27, and a second housing internal connecting rib 25, where:

[0195] The second box shell clip 26 is an L-shaped structure, with its vertical portion abutting against the right end of the second box shell surface extension 23, and its horizontal portion abutting against the outer surface of the second box shell surface extension 23. The second box shell clip 26 and the second box shell surface extension 23 are fixedly connected by the second box shell fastener 27;

[0196] The left end of the second housing clip 26 is tilted upward;

[0197] The second shell internal connecting rib 25 is vertically connected between the second shell internal reinforcement portion 22 and the second shell surface extension portion 23, and encloses the second shell internal reinforcement portion 22 and the second shell surface extension portion 23 to form a second shell internal reinforcement cavity opening to the right;

[0198] The length of the second tank shell internal reinforcement portion 22 is shorter than the length of the second tank shell surface extension portion 23 .

[0199] In combination with the first and second embodiments, the first frame 3 further includes a first frame inner lining zipper installation groove 32, a first frame inner lining steel wire installation groove 33, a first frame left side support rib 34, a first frame zipper installation groove 35, a first frame top docking portion 36, a first frame snap-fit assembly groove 37, a first frame right side convex rib 38, and a first frame internal reinforcement groove 39, wherein:

[0200] The first frame lining zipper installation slot 32 is provided in the middle of the first frame 3 and its opening faces downwards for accommodating the inner lining 7;

[0201] The first frame lining steel wire installation groove 33 is provided at the lower middle portion of the first frame 3, and its opening faces downward, and is used to accommodate the lining fixing steel wire 8, and is then connected to the first frame 3 via the inner lining fixing portion 9 wrapped around the outer periphery of the lining fixing steel wire 8;

[0202] The first frame left side support rib 34 is provided at the lower left side of the first frame 3 and is used to support the first frame zipper 5 and the second frame zipper 6 together with the second frame 4;

[0203] The first frame zipper installation slot 35 is provided in the middle of the first frame 3 , and its opening faces the left side, for accommodating the inner side of the first frame zipper 5 ;

[0204] The first frame top docking portion 36 is laterally disposed on the upper portion of the first frame 3 and is used to engage the first box shell end undercut portion 14 or the first box shell clip 16 when the first box shell 1 is inserted into the first frame 3;

[0205] The first frame snap-fitting groove 37 is provided at the upper portion of the first frame 3 , with its opening facing rightward, for snap-fitting the opening of the first box shell 1 ;

[0206] The right side rib 38 of the first frame is provided at the lower right side of the first frame 3 and above the right side extension portion 31 of the first frame, and is used to extend into the inner reinforcement cavity of the first shell when the first shell 1 is inserted into the first frame 3;

[0207] The first frame internal reinforcement groove 39 is provided on the right side of the first frame 3 and is formed by the first frame right side rib 38, the first frame 3 and the first frame right side extension 31, and is used to fix the first box shell internal reinforcement 12;

[0208] The second frame 4 further includes 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 docking portion 46, a second frame snap-fit assembly groove 47, a second frame left side convex rib 48, and a second frame internal reinforcement groove 49, wherein:

[0209] The second frame lining zipper installation slot 42 is provided in the middle of the second frame 4 and its opening faces downwards for accommodating the inner lining 7;

[0210] The second frame steel wire installation groove 43 is provided at the lower middle portion of the second frame 4, and its opening faces downward, and is used to accommodate the lining fixing steel wire 8, and is then connected to the second frame 4 via the inner lining fixing portion 9 wrapped around the outer periphery of the lining fixing steel wire 8;

[0211] The second frame right side support rib 44 is provided at the lower right side of the second frame 4 and is used to support the first frame zipper 5 and the second frame zipper 6 together with the first frame 3;

[0212] The second frame zipper installation slot 45 is provided in the middle of the second frame 4, and its opening faces right side, for accommodating the inner side of the second frame zipper 6;

[0213] The second frame top docking portion 46 is laterally disposed on the upper portion of the second frame 4 and is used to engage the second box shell end undercut portion 24 or the second box shell clip 26 when the second box shell 2 is inserted into the second frame 4;

[0214] The second frame snap-fitting assembly groove 47 is provided on the upper portion of the second frame 4, with its opening facing the left side, for snap-fitting the opening of the second box shell 2;

[0215] The left side rib 48 of the second frame is provided at the lower left side of the second frame 4 and above the left side extension portion 41 of the second frame, and is used to extend into the inner reinforcement cavity of the second shell when the second shell 2 is inserted into the second frame 4;

[0216] The second frame internal reinforcement groove 49 is provided on the left side of the second frame 4 and is formed by the second frame left side rib 48, the second frame 4 and the second frame left side extension 41, and is used to fix the second box shell internal reinforcement part 22.

[0217] 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 reinforcement cavity of the first box shell; 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 reinforcement cavity of the second box shell.

[0218] The specific working principle of embodiment 1 / 2:

[0219] like Figure 5 As shown in FIG8 , taking the first box shell 1 and the first frame 3 as an example, the first box shell 1 is inserted into the first frame 3 to the left along the direction of the arrow. A little force is needed on the first frame 3. The first box shell end inverted portion 14 (or the first box shell clip 16) and the first box shell surface extension 13 first move along the first frame right side rib 38 in an inclined state of left high and right low to the first frame clamping assembly groove 37. The first box shell internal reinforcement portion 12 moves to the left along the first frame right side extension 31 at the same time, so that the top docking portion 36 of the first frame is clamped by the first box shell end inverted portion 14 (or the first box shell clip The strip 16) is pushed upward, and the first box shell end inverted portion 14 (or the first box shell clamping strip 16) and the first box shell surface extension portion 13 pass through the right side entrance of the first frame clamping assembly groove 37 in turn, and the first box shell end inverted portion 14 (or the first box shell clamping strip 16) abuts against the inner side of the first frame top docking portion 36. At the same time, the right side rib 38 of the first frame is inserted into the inner reinforcement cavity of the first box shell with an opening to the left, and abuts against the left side of the internal connecting rib 15 of the first box shell, forming a mutually engaged state. At this time, the first box shell 1 is clamped and fixed in the first frame clamping assembly groove 37 and cannot fall out.

[0220] Similarly, taking the second box shell 2 and the second frame 4 as an example, the second box shell 2 is inserted into the second frame 4 to the right along the direction of the arrow. It is necessary to apply a little force to the second frame 4. The second box shell end undercut portion 24 (or the second box shell clip 26) and the second box shell surface extension portion 23 first move along the second frame left side rib 48 in a tilted state of right higher and left lower to the second frame clip assembly groove 47. The second box shell internal reinforcement portion 22 simultaneously moves to the right along the second frame left side extension 41, so that the second frame top docking portion 46 is secured by the second box shell end undercut portion 24 (or the second box shell clip The strip 26) is pushed upward, and the second box shell end inverted portion 24 (or the second box shell clamping strip 26) and the second box shell surface extension portion 23 pass through the left entrance of the second frame clamping assembly groove 47 in sequence, and the second box shell end inverted portion 24 (or the second box shell clamping strip 26) abuts against the inner side of the second frame top docking portion 46. At the same time, the left side convex rib 48 of the second frame is inserted into the internal reinforcement cavity of the second box shell with an opening to the right, and abuts against the right side of the internal connecting rib 25 of the second box shell, forming a mutually engaged state. At this time, the second box shell 2 is clamped and fixed in the second frame clamping assembly groove 47 and cannot fall out.

[0221] Example 3

[0222] refer to Figure 9-11 The first box shell 1 further includes a first box shell clip 16, a first box shell fastener 17, and a first box shell internal connecting rib 15, wherein:

[0223] The first box shell clip 16 is an L-shaped structure, with its vertical portion abutting against the left end of the first box shell internal reinforcement portion 12, and its horizontal portion abutting against the upper surface of the first box shell internal reinforcement portion 12, and the first box shell clip 16 and the first box shell internal reinforcement portion 12 are fixedly connected by the first box shell fastener 17;

[0224] The right end of the first housing clip 16 is tilted upward;

[0225] The first shell internal connection rib 15 is vertically connected between the first shell internal reinforcement portion 12 and the first shell surface extension portion 13, and encloses the first shell internal reinforcement portion 12 and the first shell surface extension portion 13 to form a first shell internal reinforcement cavity opening to the left;

[0226] The length of the first shell internal reinforcement portion 12 is longer than the length of the first shell surface extension portion 13;

[0227] The second housing 2 further includes a second housing clip 26, a second housing fastener 27, and a second housing internal connecting rib 25, wherein:

[0228] The second housing clamping strip 26 is in an L-shaped structure, its vertical part abuts against the right end of the inner reinforcing part 22 of the second housing, its horizontal part abuts against the upper surface of the inner reinforcing part 22 of the second housing, and the second housing clamping strip 26 and the inner reinforcing part 22 of the second housing are fixedly connected by the second housing fastener 27;

[0229] The left end of the second housing clamping strip 26 inclines upward;

[0230] The inner connecting rib 25 of the second housing is vertically connected between the inner reinforcing part 22 of the second housing and the surface layer extension part 23 of the second housing, and encloses a second housing inner reinforcing cavity with an opening to the right with the inner reinforcing part 22 of the second housing and the surface layer extension part 23 of the second housing;

[0231] The length of the inner reinforcing part 22 of the second housing is longer than the length of the surface layer extension part 23 of the second housing.

[0232] Further, the first frame 3 further includes a first frame inner lining zipper installation groove 32, a first frame inner lining steel wire installation groove 33, a first frame left side support rib 34, a first frame zipper installation groove 35, a first frame top docking part 36, and a first frame clamping and assembling groove 37, wherein:

[0233] The first frame inner lining zipper installation groove 32 is arranged at a position slightly to the right of the middle of the first frame 3, and its opening faces downward, for accommodating the inner lining 7;

[0234] The first frame inner lining steel wire installation groove 33 is arranged in the middle of the first frame 3, and its opening faces downward, for accommodating the inner lining fixing steel wire 8, and is further connected to the first frame 3 through the inner lining fixing part 9 wrapped around the periphery of the inner lining fixing steel wire 8;

[0235] The first frame left side support rib 34 is arranged at the lower left side of the first frame 3, for jointly supporting the first frame zipper 5 and the second frame zipper 6 with the second frame 4;

[0236] The first frame zipper installation groove 35 is arranged at a position slightly to the left of the middle of the first frame 3, and its opening faces left, for accommodating the inner side of the first frame zipper 5;

[0237] The first frame top docking part 36 is horizontally arranged at the upper part of the first frame 3;

[0238] The first frame clamping and assembling groove 37 is arranged at the upper part of the first frame 3, and its opening faces right, for clamping the first housing 1;

[0239] The second frame 4 further includes 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 docking part 46, and a second frame clamping and assembling groove 47, where:

[0240] The second frame inner lining zipper installation groove 42 is arranged at a position slightly to the left of the middle of the second frame 4, and its opening faces downward, and is used for accommodating the inner lining 7 inside;

[0241] The second frame steel wire installation groove 43 is arranged in the middle of the second frame 4, and its opening faces downward, and is used for accommodating the inner lining fixing steel wire 8, and then is connected to the first frame 3 through the inner lining fixing part 9 wrapped around the periphery of the inner lining fixing steel wire 8;

[0242] The second frame right side support rib 44 is arranged at the lower right side of the second frame 4, and is used for jointly supporting the first frame zipper 5 and the second frame zipper 6 with the first frame 3;

[0243] The second frame zipper installation groove 45 is arranged at a position slightly to the right of the middle of the second frame 4, and its opening faces to the right, and is used for accommodating the inner side of the second frame zipper 6;

[0244] The second frame top docking part 46 is horizontally arranged at the upper part of the second frame 4;

[0245] The second frame clamping and assembling groove 47 is arranged at the upper part of the second frame 4, and its opening faces to the left, and is used for clamping the second box shell 2.

[0246] Further referring to Figure 9 and 10 , the first frame top docking part 36 includes a first frame top docking part outer abutting part 361, a first frame top docking part inner abutting part 362, and a first frame top docking part outward extending part 363. When the first box shell 1 is buckled with the first frame 3:

[0247] The first frame top docking part outer abutting part 361 abuts against the left end of the first box shell surface layer extending part 13;

[0248] The first frame top docking part inner abutting part 362 abuts against the right end of the first box shell clamping strip 16;

[0249] The first frame top docking part outward extending part 363 abuts against the left side of the first box shell inner connecting rib 15;

[0250] The top docking portion 46 of the second frame includes an outer abutting portion 461 of the top docking portion of the second frame, an inner abutting portion 462 of the top docking portion of the second frame, and an outward extending portion 463 of the top docking portion of the second frame. When the second housing 2 is buckled with the second frame 4:

[0251] The outer abutting portion 461 of the top docking portion of the second frame abuts against the right end of the surface layer extension portion 23 of the second housing;

[0252] The inner abutting portion 462 of the top docking portion of the second frame abuts against the left end of the clamping strip 26 of the second housing;

[0253] The outward extending portion 463 of the top docking portion of the second frame abuts against the right side of the internal connecting rib 25 of the second housing.

[0254] Preferably, the inner lining zipper installation groove 32 of the first frame, the inner lining steel wire installation groove 33 of the first frame, and the zipper installation groove 35 of the first frame are located at the same horizontal position; and / or, the inner lining zipper installation groove 42 of the second frame, the steel wire installation groove 43 of the second frame, and the zipper installation groove 45 of the second frame are located at the same horizontal position.

[0255] Preferably, the lateral width of the clamping and assembling groove 37 of the first frame is adapted to the lateral width of the clamping strip 16 of the first housing to prevent loosening of the connection between the first housing 1 and the first frame 3; and / or, the lateral width of the clamping and assembling groove 47 of the second frame is adapted to the lateral width of the clamping strip 26 of the second housing to prevent loosening of the connection between the second housing 2 and the second frame 4.

[0256] Specific working principle of Embodiment 3:

[0257] As Figure 11 shown, taking the first housing 1 and the first frame 3 as an example, insert the first housing 1 into the first frame 3 to the left along the arrow direction. Slightly apply force to the first frame 3. The internal reinforcing portion 12 of the first housing and the clamping strip 16 of the first housing first move along the right side extension portion 31 of the first frame towards the clamping and assembling groove 37 of the first frame. The top docking portion 36 of the first frame is lifted upward by the clamping strip 16 of the first housing. After the internal reinforcing portion 12 of the first housing and the clamping strip 16 of the first housing pass through the right entrance of the clamping and assembling groove 37 of the first frame in sequence, the outer abutting portion 361 of the top docking portion of the first frame abuts against the left end of the surface layer extension portion 13 of the first housing, the inner abutting portion 362 of the top docking portion of the first frame abuts against the right end of the clamping strip 16 of the first housing, and the outward extending portion 363 of the top docking portion of the first frame abuts against the left side of the internal connecting rib 15 of the first housing, forming a mutually engaged state. At this time, the first housing 1 is clamped and fixed in the clamping and assembling groove 37 of the first frame and cannot be removed.

[0258] Similarly, when inserting the second housing 2 into the second frame 4 to the right along the arrow direction, a little force needs to be applied to the second frame 4. The internal reinforcement part 22 and the second housing clamping strip 26 of the second housing first move along the left extension part 41 of the second frame towards the second frame clamping and fitting groove 47. The top docking part 46 of the second frame is lifted upward by the second housing clamping strip 26. After the internal reinforcement part 22 and the second housing clamping strip 26 of the second housing pass through the left entrance of the second frame clamping and fitting groove 47 in sequence, the outer abutting part 461 of the top docking part of the second frame abuts against the right end of the surface layer extension part 23 of the second housing, the inner abutting part 462 of the top docking part of the second frame abuts against the left end of the second housing clamping strip 26, and the outward extension part 463 of the top docking part of the second frame abuts against the right side of the internal connecting rib 25 of the second housing, forming a mutually engaged state. At this time, the second housing 2 is clamped and fixed in the second frame clamping and fitting groove 47 and cannot be disengaged.

[0259] Example 4

[0260] Reference Figure 12-17 , the first frame zipper 5 is provided at the top of the first frame 3; the second frame zipper 6 is provided at the top of the second frame 4.

[0261] As Figure 12-14 , the first housing 1 further includes a first housing clamping strip 16 and a first housing fastener 17, where:

[0262] The first housing clamping strip 16 has an L-shaped structure. Its vertical part abuts against the left end of the internal reinforcement part 12 of the first housing, and its horizontal part abuts against the lower surface of the internal reinforcement part 12 of the first housing, and the first housing clamping strip 16 and the internal reinforcement part 12 of the first housing are fixedly connected through the first housing fastener 17;

[0263] The right end of the horizontal part of the first housing clamping strip 16 inclines downward;

[0264] The length of the internal reinforcement part 12 of the first housing is longer than the length of the surface layer extension part 13 of the first housing.

[0265] In this embodiment, the first housing 1 further includes a first housing internal connecting rib 15. The first housing internal connecting rib 15 is vertically connected between the internal reinforcement part 12 and the surface layer extension part 13 of the first housing, and encloses a first housing internal reinforcement cavity with an opening to the left with the internal reinforcement 12 and the surface layer extension part 13 of the first housing, which can effectively enhance the support strength of the mouth part of the first housing 1.

[0266] Preferably, the first housing body 11, the first housing internal reinforcement part 12, and the first housing surface layer extension part 13 are integrally formed or stamping formed, effectively increasing the service life of the first housing 1.

[0267] The second housing 2 further includes a second housing clamping strip 26 and a second housing fastener 27, where:

[0268] The second housing clamping strip 26 is in an L-shaped structure, its vertical part abuts against the right end of the second housing internal reinforcement part 22, and its horizontal part abuts against the lower surface of the second housing internal reinforcement part 22, and the second housing clamping strip 26 and the second housing internal reinforcement part 22 are fixedly connected through the second housing fastener 27;

[0269] The left end of the horizontal part of the second housing clamping strip 26 is inclined downward;

[0270] The length of the second housing internal reinforcement part 22 is longer than the length of the second housing surface layer extension part 23.

[0271] In this embodiment, the second housing 2 further includes a second housing internal connecting rib 25. The second housing internal connecting rib 25 is vertically connected between the second housing internal reinforcement part 22 and the second housing surface layer extension part 23, and encloses a second housing internal reinforcement cavity with an opening to the right with the second housing internal reinforcement part 22 and the second housing surface layer extension part 23, which can effectively enhance the support strength of the mouth part of the second housing 2.

[0272] Preferably, the second housing body 21, the second housing internal reinforcement part 22, and the second housing surface layer extension part 23 are integrally formed or stamping formed, effectively increasing the service life of the second housing 2.

[0273] Embodiment Five

[0274] As Figure 15-17 , the first housing 1 further includes a first housing clamping part 18. The first housing clamping part 18 is located below the left side of the first housing internal reinforcement part 12 and is inclined downward gradually from left to right;

[0275] The length of the first housing internal reinforcement part 12 is longer than the length of the first housing surface layer extension part 13.

[0276] Preferably, the first housing body 11, the first housing internal reinforcement part 12, the first housing surface layer extension part 13, and the first housing clamping part 18 are integrally formed or stamping formed, effectively increasing the service life of the first housing 1.

[0277] The second housing 2 further includes a second housing clamping portion 28, which is located below the right side of the second housing internal reinforcement portion 22 and gradually tilts downward from right to left.

[0278] The length of the second shell internal reinforcement portion 22 is longer than the length of the second shell surface extension portion 23 .

[0279] Preferably, the second box shell body 21, the second box shell internal reinforcement portion 22, the second box shell surface extension portion 23, and the second box shell clamping portion 28 are integrally formed or stamped, which effectively increases the service life of the second box shell 2.

[0280] Furthermore, the first frame 2 further includes a first frame inner lining steel wire installation groove 33, a first frame inner lining zipper installation groove 32, a first frame left side support rib 34, a first frame zipper installation groove 35, a first frame top docking portion 36, a first frame snap-fit assembly groove 37, and a first frame undercut portion 310, wherein:

[0281] The first frame lining zipper installation slot 32 is located at the middle right position of the first frame 3, and its opening faces downward, for accommodating the inner lining 7;

[0282] The first frame lining steel wire installation groove 33 is provided in the middle of the first frame 3, and its opening faces downward, and is used to accommodate the lining fixing steel wire 8, and then connected to the first frame 3 through the internal lining fixing portion 9 wrapped around the outer periphery of the lining fixing steel wire 8;

[0283] The first frame left side support rib 34 is provided on the left side of the first frame 3, and is used to support the first frame zipper 5 and the second frame zipper 6 together with the second frame 4, and to make the opposing surfaces of the first frame 3 and the second frame zipper 6 abut against each other when the first frame zipper 5 and the second frame zipper 6 are closed;

[0284] The first frame zipper installation slot 35 is provided at the top of the first frame 2, and its opening faces the left side, for accommodating the inner side of the first frame zipper 5;

[0285] The first frame top docking portion 35 is laterally disposed on the top of the first frame 3 and is located on the right side of the first frame zipper mounting slot 35;

[0286] The first frame snap-fitting groove 37 is provided in the middle of the first frame 3 and its opening faces right, and is used for snap-fitting the first box shell 1;

[0287] The first frame undercut portion 310 is vertically provided at the right opening of the first frame clamping assembly groove 37 and is used for clamping the first box shell 1;

[0288] The second frame 4 further includes a second frame steel wire installation groove 43, a second frame lining zipper installation groove 42, a second frame right side support rib 44, a second frame zipper installation groove 45, a second frame top docking portion 46, a second frame snap-fit assembly groove 47, and a second frame undercut portion 410, wherein:

[0289] The second frame lining zipper installation slot 42 is located at the middle left position of the second frame 4, and its opening faces downward, for accommodating the inner lining 7;

[0290] The second frame steel wire installation groove 43 is provided in the middle of the second frame 4, and its opening faces downward, and is used to accommodate the liner fixing steel wire 8, and then connected to the second frame 4 through the inner liner fixing portion 9 wrapped around the outer periphery of the liner fixing steel wire 8;

[0291] The second frame right side support rib 44 is provided on the right side of the second frame 4, and is used to support the first frame zipper 5 and the second frame zipper 6 together with the first frame 3, and to make the opposing surfaces of the first frame 3 and the second frame zipper 6 abut against each other when the first frame zipper 5 and the second frame zipper 6 are closed;

[0292] The second frame zipper mounting groove 45 is provided at the top of the second frame 4, and its opening faces right side, for accommodating the inner side of the second frame zipper 6;

[0293] The second frame top docking portion 46 is laterally disposed on the top of the second frame 4 and is located on the left side of the second frame zipper mounting slot 45;

[0294] The second frame snap-fitting groove 47 is provided in the middle of the second frame 4 and its opening faces the left side, and is used for snap-fitting the second box shell 2;

[0295] The second frame undercut portion 410 is vertically provided at the left opening of the second frame snap-fitting assembly groove 47 for snap-fitting the second box shell 2 .

[0296] Furthermore, the first frame top docking portion 36 includes a first frame top docking portion outer abutting portion 361 and a first frame top docking portion outwardly extending portion 363. When the first box shell 1 is buckled with the first frame 3:

[0297] The right end of the outer abutting portion 361 of the first frame top abutting portion abuts against the left end of the first box shell surface extension portion 13;

[0298] The upper surface of the outward extension portion 363 of the first frame top docking portion abuts against the lower surface of the first box shell surface extension portion 13 .

[0299] In this embodiment, the lateral width of the first frame snap-fit assembly groove 37 is adapted to the lateral width of the first box shell snap-fit portion 18 or the first box shell clip strip 16, so as to prevent the first box shell 1 from loosening the connection with the first frame 3.

[0300] The second frame top docking portion 46 includes a second frame top docking portion outer abutting portion 461 and a second frame top docking portion outwardly extending portion 463. When the second box shell 2 is buckled with the second frame 4:

[0301] The left end of the outer abutting portion 461 of the second frame top abutting portion abuts against the right end of the second box shell surface extension portion 23;

[0302] The upper surface of the outward extension portion 463 of the second frame top docking portion abuts against the lower surface of the second box shell surface extension portion 23.

[0303] In this embodiment, the lateral width of the second frame snap-fit assembly groove 47 is adapted to the lateral width of the second box shell snap-fit portion 28 or the second box shell clip strip 26, so as to prevent the second box shell 2 from loosening the connection with the second frame 4.

[0304] The specific working principles of the fourth and fifth embodiments are as follows:

[0305] like Figure 14 As shown in FIG17, taking the first housing 1 and the first frame 3 as an example, the first housing 1 is inserted into the first frame 3 to the left along the direction of the arrow. A little force is needed on the first frame 3. The first housing clamping portion 18 (as shown in FIG17) Figure 16 ) or the first box shell card strip 16 (such as Figure 13 ) First, move horizontally along the right side extension portion 31 of the first frame which is in a state of being higher on the left and lower on the right to the first frame clamping assembly groove 37, the top docking portion 36 of the first frame is pushed upward by the first box shell internal reinforcement portion 12, and the right side extension portion 31 of the first frame is pushed downward by the first box shell internal reinforcement portion 12, and the first box shell internal reinforcement portion 12 and the first box shell clamping portion 18 (as shown in FIG. Figure 16 ) / first box shell card strip 16 (such as Figure 13 ) passes through the right entrance of the first frame clamping assembly groove 37 in sequence, the left side of the first shell surface extension portion 13 abuts against the right side of the outer abutting portion 361 of the first frame top docking portion, and the first shell clamping portion 18 (such as Figure 16 ) / first box shell card strip 16 (such as Figure 13 ) abut against the inner side of the first frame undercut portion 310 to form a mutually engaged state. At this time, the outward extension portion 363 of the top docking portion of the first frame is inserted into the inner reinforcement cavity of the first box shell with an opening to the left, so that the first box shell 1 is clamped and fixed in the first frame clamping assembly groove 37 and cannot fall out.

[0306] Similarly, if Figure 14 As shown in FIG17, taking the second housing 2 and the second frame 4 as an example, the second housing 2 is inserted into the second frame 4 to the right along the direction of the arrow. A little force is needed on the second frame 4. The second housing clamping portion 28 (as shown in FIG17) Figure 16 ) or the second housing card strip 26 (such as Figure 13 ) First, move horizontally along the left side extension portion 41 of the second frame in a state of right higher and left lower toward the second frame clamping assembly groove 47, the second frame top docking portion 46 is pushed up by the second box shell internal reinforcement portion 22, the second frame left side extension 41 is pushed down by the second box shell internal reinforcement portion 44, the second box shell internal reinforcement portion 44 and the second box shell clamping portion 28 (as shown in FIG. Figure 16 ) / Second box shell card strip 26 (such as Figure 13 ) passes through the left entrance of the second frame clamping assembly groove 47 in sequence, the right side of the second shell surface extension portion 23 abuts against the left side of the outer abutting portion 461 of the second frame top docking portion, and the second shell clamping portion 28 (such as Figure 16 ) / Second box shell card strip 26 (such as Figure 13 ) abut against the inner side of the second frame undercut portion 410, forming a mutually engaged state. At this time, the outward extension portion 463 of the second frame top docking portion is inserted into the reinforcing cavity inside the second box shell with an opening to the right, so that the second box shell 2 is clamped and fixed in the second frame clamping assembly groove 47 and cannot fall out.

[0307] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An injection-molded suitcase middle frame without glue fixation and a rapid assembly structure, characterized in that The invention comprises a first box shell, a second box shell, a first frame, a second frame, a first frame zipper and a second frame zipper, wherein: The main body of the first frame is arranged at the mouth of the first box shell. The first frame and the mouth of the first box shell are both provided with an inverted structure. The first frame is fixedly connected to the inverted structure of the mouth of the first box shell. The inverted structure of the first frame and the inverted structure of the mouth of the first box shell are engaged with each other. The first housing includes a first housing body, a first housing internal reinforcement portion, and a first housing surface extension portion, wherein: The first box shell internal reinforcement portion is fixedly connected to the left end of the first box shell body; The first shell surface extension portion is located above the first shell internal reinforcement portion and extends obliquely to the left from the connection between the first shell internal reinforcement portion and the first shell body; The first box shell is fixed to the first frame by means of the first box shell internal reinforcement portion and the first box shell surface extension portion; The first frame includes a first frame right side extension portion, which is provided on the right side of the first frame and is in a state of being higher on the left and lower on the right or in a horizontal state, and is used to introduce the first box shell; The main body of the second frame is arranged at the mouth of the second box shell. The second frame and the mouth of the second box shell are both provided with an inverted structure. The second frame is fixedly connected to the inverted structure of the second box shell mouth. The inverted structure of the second frame and the inverted structure of the second box shell mouth engage with each other. The second housing includes a second housing body, a second housing internal reinforcement portion, and a second housing surface extension portion, wherein: The inner reinforcement portion of the second housing is fixedly connected to the right end of the second housing body; The second shell surface extension portion is located above the second shell internal reinforcement portion and extends obliquely to the right from the connection between the second shell internal reinforcement portion and the second shell body; The second box shell is fixed to the second frame by means of the second box shell internal reinforcement portion and the second box shell surface extension portion; The second frame includes a second frame left side extension portion, which is provided on the left side of the second frame and is in a state of being higher on the right and lower on the left or in a horizontal state, and is used to introduce the second box shell; The inner side of the first frame zipper is snap-fitted to the first frame, the inner side of the second frame zipper is snap-fitted to the second frame, and the outer sides of the first frame zipper and the second frame zipper are zipped together to form a closed interior space of the box.

2. The injection-molded travel case glue-free fixed middle frame and rapid assembly structure according to claim 1, characterized in that, The first frame zipper is embedded in the left middle portion of the first frame; the second frame zipper is embedded in the right middle portion of the second frame.

3. The injection molded travel case glue-free fixed middle frame and rapid assembly structure according to claim 2, wherein The first box shell further includes an undercut portion at the end of the first box shell and internal connecting ribs of the first box shell, wherein: The undercut portion at the end of the first shell is fixedly connected to the left end of the surface extension portion of the first shell and extends partially to the right; The first shell internal connection rib is vertically connected between the first shell internal reinforcement portion and the first shell surface extension portion, and encloses the first shell internal reinforcement portion and the first shell surface extension portion to form a first shell internal reinforcement cavity opening to the left; The length of the first shell internal reinforcement portion is shorter than the length of the first shell surface extension portion; The second housing further comprises an undercut portion at the end of the second housing and internal connecting ribs of the second housing, wherein: The undercut portion at the end of the second shell is fixedly connected to the right end of the surface extension portion of the second shell and extends partially to the left; The second shell internal connecting rib is vertically connected between the second shell internal reinforcement portion and the second shell surface extension portion, and encloses the second shell internal reinforcement portion and the second shell surface extension portion to form a second shell internal reinforcement cavity opening to the right; The length of the inner reinforcement portion of the second shell is shorter than the length of the surface extension portion of the second shell.

4. The injection-molded travel case glue-free fixed middle frame and rapid assembly structure according to claim 2, wherein, The first box shell further includes a first box shell clip, a first box shell fastener, and a first box shell internal connecting rib, wherein: The first box shell clip is in an L-shaped structure, with its vertical portion abutting against the left end of the first box shell surface extension, and its horizontal portion abutting against the outer surface of the first box shell surface extension, and the first box shell clip and the first box shell surface extension are fixedly connected by the first box shell fastener; The right end of the first box shell clip is tilted upward; The first shell internal connection rib is vertically connected between the first shell internal reinforcement portion and the first shell surface extension portion, and encloses the first shell internal reinforcement portion and the first shell surface extension portion to form a first shell internal reinforcement cavity opening to the left; The length of the first shell internal reinforcement portion is shorter than the length of the first shell surface extension portion; The second box shell further includes a second box shell clip, a second box shell fastener, and a second box shell internal connecting rib, wherein: The second box shell clip is an L-shaped structure, with its vertical portion abutting against the right end of the second box shell surface extension, and its horizontal portion abutting against the outer surface of the second box shell surface extension, and the second box shell clip is fixedly connected to the second box shell surface extension by the second box shell fastener; The left end of the second housing clip is tilted upward; The second shell internal connecting rib is vertically connected between the second shell internal reinforcement portion and the second shell surface extension portion, and encloses the second shell internal reinforcement portion and the second shell surface extension portion to form a second shell internal reinforcement cavity opening to the right; The length of the inner reinforcement portion of the second shell is shorter than the length of the surface extension portion of the second shell.

5. The injection molded luggage mid-frame and quick assembly structure without glue fixation according to claim 3 or 4, characterized in that, The first frame further includes a first frame inner lining zipper installation groove, a first frame inner lining steel wire installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking portion, a first frame snap-fit assembly groove, a first frame right side rib, and a first frame internal reinforcement groove, wherein: The first frame lining zipper installation slot is provided in the middle of the first frame, and its opening faces downwards, for accommodating the inner lining; The first frame lining steel wire installation groove is provided at the lower middle portion of the first frame, with its opening facing downward, for accommodating the lining fixing steel wire, and then connected to the first frame via the inner lining fixing portion wrapped around the outer periphery of the lining fixing steel wire; The left support rib of the first frame is provided below the left side of the first frame and is used to jointly support the first frame zipper and the second frame zipper with the second frame; The first frame zipper installation groove is provided in the middle of the first frame, and its opening faces leftward, and is used to accommodate the inner side of the first frame zipper; The top docking part of the first frame is horizontally provided on the upper part of the first frame; The first frame clamping and assembling groove is provided on the upper part of the first frame, and its opening faces rightward, and is used to clamp the mouth part of the first box shell; The right convex rib of the first frame is provided below the right side of the first frame and above the right extension part of the first frame, and is used to extend into the inner reinforcing cavity of the first box shell when the first box shell is inserted into the first frame; The inner reinforcing part groove of the first frame is provided on the right side of the first frame and is formed by enclosing the right convex rib of the first frame, the first frame and the right extension part of the first frame, and is used to fix the inner reinforcing part of the first box shell; The second frame further includes a second frame inner lining zipper installation groove, a second frame steel wire installation groove, a second frame right support rib, a second frame zipper installation groove, a second frame top docking part, a second frame clamping and assembling groove, a second frame left convex rib, and a second frame inner reinforcing part groove, wherein: The second frame inner lining zipper installation groove is provided in the middle of the second frame, and its opening faces downward, and is used to accommodate the inner lining; The second frame steel wire installation groove is provided below the middle of the second frame, and its opening faces downward, and is used to accommodate the inner lining fixing steel wire, and then is connected to the second frame through the inner lining fixing part wrapped around the periphery of the inner lining fixing steel wire; The right support rib of the second frame is provided below the right side of the second frame and is used to jointly support the first frame zipper and the second frame zipper with the first frame; The second frame zipper installation groove is provided in the middle of the second frame, and its opening faces rightward, and is used to accommodate the inner side of the second frame zipper; The top docking part of the second frame is horizontally provided on the upper part of the second frame; The second frame clamping and assembling groove is provided on the upper part of the second frame, and its opening faces leftward, and is used to clamp the mouth part of the second box shell; The left convex rib of the second frame is provided below the left side of the second frame and above the left extension part of the second frame, and is used to extend into the inner reinforcing cavity of the second box shell when the second box shell is inserted into the second frame; The inner reinforcing part groove of the second frame is provided on the left side of the second frame and is formed by enclosing the left convex rib of the second frame, the second frame and the left extension part of the second frame, and is used to fix the inner reinforcing part of the second box shell.

6. The injection-molded suitcase glue-free fixed middle frame and rapid assembly structure according to claim 2, 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 inner connecting rib, wherein: The first box shell clamping strip has an L-shaped structure, its vertical part abuts against the left end of the inner reinforcing part of the first box shell, its horizontal part abuts against the upper surface of the inner reinforcing part of the first box shell, and the first box shell clamping strip and the inner reinforcing part of the first box shell are fixedly connected through the first box shell fastener; The right end of the first casing clamping strip slopes upward; The internal connecting rib inside the first casing is vertically connected between the internal reinforcing part and the surface layer extending part of the first casing, and encloses a first internal reinforcing cavity of the first casing with an opening to the left together with the internal reinforcing part and the surface layer extending part of the first casing; The length of the internal reinforcing part of the first casing is longer than the length of the surface layer extending part of the first casing; The second casing further includes a second casing clamping strip, a second casing fastener, and a second casing internal connecting rib, where: The second casing clamping strip has an L-shaped structure, its vertical part abuts against the right end of the internal reinforcing part of the second casing, its horizontal part abuts against the upper surface of the internal reinforcing part of the second casing, and the second casing clamping strip and the internal reinforcing part of the second casing are fixedly connected through the second casing fastener; The left end of the second casing clamping strip slopes upward; The second casing internal connecting rib is vertically connected between the internal reinforcing part and the surface layer extending part of the second casing, and encloses a second internal reinforcing cavity of the second casing with an opening to the right together with the internal reinforcing part and the surface layer extending part of the second casing; The length of the internal reinforcing part of the second casing is longer than the length of the surface layer extending part of the second casing.

7. A glue-free fixed middle frame and rapid assembly structure for an injection molded travel case according to claim 6, characterized in that, The first frame further includes a first frame inner lining zipper installation groove, a first frame inner lining steel wire installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking part, and a first frame clamping and assembling groove, where: The first frame inner lining zipper installation groove is provided at a position slightly to the right of the middle of the first frame, and its opening faces downward, for accommodating the internal lining; The first frame inner lining steel wire installation groove is provided in the middle of the first frame, and its opening faces downward, for accommodating the lining fixing steel wire, and is then connected to the first frame through the internal lining fixing part wrapped around the periphery of the lining fixing steel wire; The first frame left side support rib is provided at the lower left side of the first frame, for jointly supporting the first frame zipper and the second frame zipper with the second frame; The first frame zipper installation groove is provided at a position slightly to the left of the middle of the first frame, and its opening faces to the left, for accommodating the inner side of the first frame zipper; The first frame top docking part is horizontally provided at the upper part of the first frame; The first frame clamping and assembling groove is provided at the upper part of the first frame, and its opening faces to the right, for clamping the first casing; The second frame further includes a second frame inner lining zipper installation groove, a second frame steel wire installation groove, a second frame right side support rib, a second frame zipper installation groove, a second frame top docking part, and a second frame clamping and assembling groove, where: The second frame inner lining zipper installation groove is provided at a position slightly to the left of the middle of the second frame, and its opening faces downward, for accommodating the internal lining; The second frame steel wire installation groove is provided in the middle of the second frame, and its opening faces downward, for accommodating the lining fixing steel wire, and is then connected to the first frame through the internal lining fixing part wrapped around the periphery of the lining fixing steel wire; The right support rib of the second frame is provided 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 groove is located at a position slightly to the right of the middle of the second frame, and its opening faces to the right and is used to accommodate the inner side of the second frame zipper. The top docking part of the second frame is horizontally arranged at the upper part of the second frame. The second frame clamping and assembling groove is arranged at the upper part of the second frame, and its opening faces to the left and is used to clamp the second box shell.

8. A glue-free fixed middle frame and rapid assembly structure for an injection molded travel case according to claim 7, characterized in that, The top docking part of the first frame includes an outer abutting part of the top docking part of the first frame, an inner abutting part of the top docking part of the first frame, and an outward extending part of the top docking part of the first frame. When the first box shell is buckled with the first frame: The outer abutting part of the top docking part of the first frame abuts against the left end of the surface layer extending part of the first box shell. The inner abutting part of the top docking part of the first frame abuts against the right end of the clamping strip of the first box shell. The outward extending part of the top docking part of the first frame abuts against the left side of the internal connecting rib of the first box shell. The top docking part of the second frame includes an outer abutting part of the top docking part of the second frame, an inner abutting part of the top docking part of the second frame, and an outward extending part of the top docking part of the second frame. When the second box shell is buckled with the second frame: The outer abutting part of the top docking part of the second frame abuts against the right end of the surface layer extending part of the second box shell. The inner abutting part of the top docking part of the second frame abuts against the left end of the clamping strip of the second box shell. The outward extending part of the top docking part of the second frame abuts against the right side of the internal connecting rib of the second box shell.

9. The injection-molded luggage mid-frame and rapid assembly structure without glue fixation according to claim 1, wherein, The first frame zipper is arranged at the top of the first frame; the second frame zipper is arranged at the top of the second frame.

10. The middle frame and assembly structure of an injection-molded luggage case according to claim 9, characterized in that, The first box shell further includes a first box shell clamping strip and a first box shell fastener, where: The first box shell clamping strip is in an L-shaped structure, its vertical part abuts against the left end of the internal reinforcement part of the first box shell, its horizontal part abuts against the lower surface of the internal reinforcement part of the first box shell, and the first box shell clamping strip and the internal reinforcement part of the first box shell are fixedly connected by the first box shell fastener. The right end of the horizontal part of the first box shell clamping strip inclines downward. The length of the internal reinforcement part of the first box shell is longer than the length of the surface layer extending part of the first box shell. The second box shell further includes a second box shell clamping strip and a second box shell fastener, where: The second box shell clamping strip is in an L-shaped structure, its vertical part abuts against the right end of the internal reinforcement part of the second box shell, its horizontal part abuts against the lower surface of the internal reinforcement part of the second box shell, and the second box shell clamping strip and the internal reinforcement part of the second box shell are fixedly connected by the second box shell fastener. The left end of the horizontal part of the second box shell clamping strip inclines downward. The length of the internal reinforcement part of the second box shell is longer than the length of the surface layer extending part of the second box shell.

11. The middle frame and assembly structure of an injection-molded luggage case according to claim 9, characterized in that, The first box shell further includes a first box shell clamping part, and the first box shell clamping part is located below the left side of the internal reinforcement part of the first box shell and gradually inclines downward from left to right. The length of the internal reinforcement portion of the first shell is longer than the length of the surface extension portion of the first shell; The second box shell further includes a second box shell clamping portion, which is located below the right side of the inner reinforcement portion of the second box shell and gradually tilts downward from right to left; The length of the inner reinforcement portion of the second shell is longer than the length of the surface extension portion of the second shell.

12. The middle frame and assembly structure of an injection-molded luggage case according to claim 10 or 11, characterized in that, The first frame further includes a first frame inner lining steel wire installation groove, a first frame inner lining zipper installation groove, a first frame left side support rib, a first frame zipper installation groove, a first frame top docking portion, a first frame snap-fit assembly groove, and a first frame undercut portion, wherein: The first frame lining zipper installation slot is located at the middle right position of the first frame, and its opening faces downwards, for accommodating the inner lining; The first frame lining steel wire installation groove is provided in the middle of the first frame, and its opening faces downward, and is used to accommodate the lining fixing steel wire, and is then connected to the first frame through the inner lining fixing portion wrapped around the outer periphery of the lining fixing steel wire; The left side support rib of the first frame is provided on the left side of the first frame, and is used to jointly support the first frame zipper and the second frame zipper together with the second frame, and to make the opposing surfaces of the first frame and the second frame abut against each other when the first frame zipper and the second frame zipper are in a closed state; The first frame zipper installation groove is provided at the top of the first frame, and its opening faces left, for accommodating the inner side of the first frame zipper; The top docking portion of the first frame is laterally arranged at the top of the first frame and is located on the right side of the zipper mounting groove of the first frame; The first frame snap-fitting assembly groove is provided in the middle of the first frame, with its opening facing right, for snap-fitting the first box shell; The first frame undercut portion is vertically arranged at the right opening of the first frame clamping assembly groove, and is used for clamping the first box shell; The second frame further includes a second frame steel wire installation groove, a second frame lining zipper installation groove, a second frame right side support rib, a second frame zipper installation groove, a second frame top docking portion, a second frame snap-fit assembly groove, and a second frame undercut portion, wherein: The second frame lining zipper installation slot is located at the left side of the middle portion of the second frame, and its opening faces downwards, for accommodating the inner lining; The second frame steel wire installation groove is provided in the middle of the second frame, and its opening faces downward, and is used to accommodate the liner fixing steel wire, and is then connected to the second frame through the inner liner fixing portion wrapped around the outer periphery of the liner fixing steel wire; The second frame right side support rib is provided on the right side of the second frame, and is used to jointly support the first frame zipper and the second frame zipper together with the first frame, and to make the opposing surfaces of the first frame and the second frame abut against each other when the first frame zipper and the second frame zipper are in a closed state; The second frame zipper mounting groove is provided at the top of the second frame, and its opening faces right side, for accommodating the inner side of the second frame zipper; The second frame top docking portion is laterally arranged at the top of the second frame and is located on the left side of the zipper mounting groove of the second frame; The second frame snap-fitting groove is provided in the middle of the second frame, with its opening facing the left side, for snap-fitting the second box shell; The second frame undercut portion is vertically arranged at the left opening of the second frame clamping assembly groove, and is used for clamping the second box shell.

13. The middle frame and assembly structure of an injection-molded luggage case according to claim 12, characterized in that, The first frame top docking portion includes an outer abutting portion of the first frame top docking portion and an outward extending portion of the first frame top docking portion. When the first box shell is buckled with the first frame: The right end of the outer abutting portion of the top docking portion of the first frame abuts against the left end of the surface extension portion of the first box shell; The upper surface of the outwardly extending portion of the top docking portion of the first frame abuts against the lower surface of the surface extending portion of the first box shell; The second frame top docking portion includes an outer abutting portion of the second frame top docking portion and an outward extending portion of the second frame top docking portion. When the second box shell is buckled with the second frame: The left end of the outer abutting portion of the second frame top abutting portion abuts against the right end of the second shell surface extension portion; The upper surface of the outwardly extending portion of the second frame top docking portion abuts against the lower surface of the second box shell surface extending portion.

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